Congress, usually through a declaration of war, has often been the first governmental authority to designate the beginning date of a war or armed conflict. The President, or executive branch officials responsible to him, through proclamation, or Congress, through legislation, has been responsible for designating the war's termination date. In some cases, later legislation is enacted to extend these beginning and ending dates for the purpose of broadening eligibility for veterans' benefits. This report notes the variations in the dates cited in the Code of Federal Regulations (C.F.R.) "periods of war" and those dates given in the declarations of war beginning and the proclamations, laws, or treaties terminating such conflicts. Adding to the confusion, during World War II, wars were declared and terminated with six individual combatant countries. Moreover, armistice dates are also often confused with termination dates. Title 38, Part 3, Section 3.2 of the Code of Federal Regulations , dealing with the Department of Veterans Affairs (VA), lists official beginning and termination dates for most war periods from the Indian Wars to the present to be used in determining the availability of veterans' benefits. The material below summarizes these dates. Where applicable, a summary of the Department of Veterans Affairs official beginning and termination dates is provided followed by a citation to the lettered C.F.R. section. For some entries, this initial summary is followed by an explanatory note or declaration, armistice, cease-fire, or termination dates cited by other official sources. Also included are dates for the recent conflicts in Iraq and Afghanistan. January 1, 1817, through December 31, 1898, inclusive. Service must have been rendered with U.S. military forces against Indian tribes or nations. Code of Federal Regulations , 3.2 (a). April 21, 1898, through July 4, 1902, inclusive. If the veteran served with the U.S. military forces engaged in hostilities in the Moro Province, the ending date is July 15, 1903. The Philippine Insurrection and the Boxer Rebellion are included for the purposes of benefit determination under this C.F.R. section. Code of Federal Regulations , 3.2 (b). Declared by an act of Congress April 25, 1898 (30 Stat. 364, Ch. 189). An armistice signed August 12, 1898. Terminated by Treaty signed at Paris, December 10, 1898 (30 Stat. 1754), ratified and proclaimed April 11, 1899. May 9, 1916, through April 5, 1917. In the case of a veteran who during such period served in Mexico, on the borders thereof, or in the adjacent waters thereto. Code of Federal Regulations , 3.2 (h). April 6, 1917, through November 11, 1918, inclusive. If the veteran served with the U.S. military forces in Russia, the ending date is April 1, 1920. Service after November 11, 1918, and before July 2, 1921, is considered World War I service if the veteran served in the active military, naval, or air service after April 5, 1917, and before November 12, 1918. Code of Federal Regulations , 3.2 (c). Declared by Joint Resolution of Congress of April 6, 1917 (40 Stat. 429, Ch. 1). Armistice signed near Compiegne, France, November 11, 1918. Terminated July 2, 1921, by Joint Resolution of Congress (42 Stat. 105, Ch. 40, 1). Declared by Joint Resolution of Congress, December 7, 1917 (40 Stat. 429, Ch. 1). An armistice signed near Compiegne, France, November 11, 1918. Terminated July 2, 1921, by Joint Resolution of Congress (42 Stat. 106, Ch. 40, 3). December 7, 1941, through December 31, 1946, inclusive. If the veteran was in service on December 31, 1946, continuous service before July 26, 1947, is considered World War II service. Code of Federal Regulations , 3.2 (d). During World War II, war was officially declared against six separate countries. The war with each was not over until the effective date of the Treaty of Peace. Note also the confusion cited below over which day is the official Victory in Europe Day (V-E Day) and Victory over Japan Day (V-J Day). Declared by Joint Resolution of Congress, December 11, 1941 (55 Stat. 796, Ch. 564). German representative Colonel General Alfred Jodl signed the unconditional act of surrender to Allied representatives in a schoolhouse in Reims, France, on May 7, 1945. A second German surrender ceremony was held on May 8 in Berlin at the insistence of the U.S.S.R. Cessation of hostilities declared as of noon, December 31, 1946, by presidential proclamation of December 31, 1946 (Proc. no. 2714, 61 Stat. 1048). State of war with the "government of Germany" terminated October 19, 1951, by Joint Resolution of Congress of that date (65 Stat. 451, Ch. 519), by Presidential Proclamation 2950, October 24, 1951. No peace treaty with Germany was signed. Declared by Joint Resolution of Congress, December 8, 1941 (55 Stat. 795, Ch. 561). Japanese representatives publicly signed unconditional surrender document on the deck of the USS Missouri anchored in Tokyo Bay on September 2, 1945. President Truman proclaimed this date Victory over Japan Day or V-J Day. Cessation of hostilities declared as of 12 noon, December 31, 1946, by presidential proclamation of December 31, 1946 (Proc. no. 2714, 61 Stat. 1048). Terminated by Multilateral Treaty of Peace with Japan, signed at San Francisco, September 8, 1951 (3 UST 3329), and ratified March 20, 1952, effective April 28, 1952. Declared by Joint Resolution of Congress, December 11, 1941 (55 Stat. 797, Ch. 565). Cessation of hostilities declared as of noon December 31, 1946, by presidential proclamation of December 31, 1946 (Proc. no. 2714, 61 Stat. 1048). Terminated by Treaty of Peace dated at Paris, February 10, 1947 (61 Stat. 1247), effective September 15, 1947. Declared by Joint Resolution of Congress, June 5, 1942 (56 Stat. 307, Ch. 323). Cessation of hostilities declared as of noon December 31, 1946, by presidential proclamation of December 31, 1946 (Proc. no. 2714, 61 Stat. 1048). Terminated by Treaty of Peace dated at Paris, February 10, 1947 (61 Stat. 1915), effective September 15, 1947. Declared by Joint Resolution of Congress, June 5, 1942 (56 Stat. 307, Ch. 324). Cessation of hostilities declared as of noon December 31, 1946, by presidential proclamation (Proc. no. 2714, 61 Stat. 1048). Terminated by Treaty of Peace dated at Paris, February 10, 1947 (61 Stat. 1757), effective September 15, 1947. Declared by Joint Resolution of Congress, June 5, 1942 (56 Stat. 307, Ch. 325). Cessation of hostilities declared as of noon December 31, 1946, by presidential proclamation of December 31, 1946 (Proc. no. 2714, 61 Stat. 1048). Terminated by Treaty of Peace dated at Paris, February 10, 1947 (61 Stat. 1757), effective September 15, 1947. June 27, 1950, through January 31, 1955, inclusive. Code of Federal Regulations , 3.2 (e). On June 25, 1950, North Korean Communist forces attacked South Korean positions south of the 38 th parallel, leading to an immediate United Nations (U.N.) Security Council resolution calling for a cease-fire and withdrawal of the North Korean forces. On June 26, President Truman ordered U.S. air and sea forces in the Far East to aid South Korea. On June 27, the U.N. Security Council adopted a resolution asking U.N. members for assistance in repelling the North Korean armed attack and in restoring peace and security in the area. On June 30, the President stated that he had authorized the use of certain U.S. air and ground units wherever necessary. No declaration of war was requested of Congress and no authorization for use of force, by statute, was requested or enacted. An armistice signed at Panmunjom, Korea, on July 27, 1953, between U.N. and Communist representatives (4 UST 234; TIAS 2782). No peace treaty was ever signed. The period beginning on February 28, 1961, and ending on May 7, 1975, inclusive, in the case of a veteran who served in the Republic of Vietnam during that period. The period beginning on August 5, 1964, and ending on May 7, 1975, inclusive, in all other cases. Code of Federal Regulations , 3.2 (f). No declaration of war was requested of Congress. Instead, there was a Joint Resolution of Congress to promote the maintenance of international peace and security in Southeast Asia, which stated in part that Congress "approves and supports the determination of the President, as Commander in Chief, to take all necessary measures to repel any armed attack against the forces of the United States and to prevent any further aggression." H.J. Res. 1145, P.L. 88-408, August 10, 1964 (78 Stat. 384). The Tonkin Gulf Resolution was formally repealed on January 12, 1971, by P.L. 91-672, (84 Stat. 2055). The Agreement Ending the War and Restoring Peace in Vietnam signed in Paris, January 27, 1973 (TIAS 7674). Joint communique implementing the agreement and protocols of January 27, 1973, signed at Paris and entered into force, June 13, 1973. Lebanon . U.S. Marines deployed on August 21, 1982 and September 29, 1982, were part of a temporary multinational force in Lebanon. See S. 639 , P.L. 98-43 (Lebanon Emergency Assistance Act of 1983). Grenada. On October 25, 1983, U.S. troops were deployed to Grenada "to restore law and order" and to protect American lives at the request of the members of the Organization of Eastern Caribbean States. Known as Operation Urgent Fury, by December 15, 1983, all forces had been withdrawn. Panama. On December 21, 1989, President George H.W. Bush reported that he had ordered U.S. military forces to Panama to protect the lives of American citizens and bring General Noriega to justice. Known as Operation Just Cause, by February 13, 1990, all the invasion forces had been withdrawn. Note: Participation in these conflicts alone does not confer automatic veterans' status for servicemembers. For more information, see CRS Report R42324, Who Is a "Veteran"?--Basic Eligibility for Veterans' Benefits , by Scott D. Szymendera, and CRS Report RL31133, Declarations of War and Authorizations for the Use of Military Force: Historical Background and Legal Implications , by Jennifer K. Elsea and Matthew C. Weed. August 2, 1990, through April 6, 1991, when Iraq officially accepted cease-fire terms. Congress passed H.J.Res. 77 , Authorizing the Use of Military Force Against Iraq, the same day it was introduced (January 12, 1991), and it was signed by the President on January 14, 1991 ( P.L. 102-1 ). Operation Desert Storm and the air war phase began at 3 a.m. January 17, 1991 (January 16, 7 p.m. Eastern Standard Time). Allied ground assault began at 4 a.m. February 24 (February 23, 8 p.m. EST). Cease-fire declared at 8:01 a.m. February 28, 1991 (12:01 a.m. EST). Cease-fire terms negotiated at Safwan, Iraq, March 1, 1991. Iraq officially accepted cease-fire terms, April 6, 1991. Cease-fire took effect April 11, 1991. Currently, the Code of Federal Regulations , 3.2 (i) does not list an official end date. On May 18, 2018, President Donald J. Trump issued a Notice to Congress, "to continue in effect beyond May 22, 2018, for 1 year the national emergency with respect to the stabilization of Iraq declared in Executive Order13303." Shortly after the terrorist attacks in the United States on September 11, 2001, President George W. Bush called on Afghanistan's leaders to hand over Osama bin Laden and other al Qaeda leaders and close their terrorist training camps. He also demanded the return of all detained foreign nationals and the opening of terrorist training sites to inspection. These demands were rejected. The Administration sought international support from the United Nations (U.N.) for military action against Afghanistan. U.N. Security Council Resolution 1368 of September 12, 2001, stated that the Council "Expresses its readiness to take all necessary steps to respond to the terrorist attacks of September 11, 2001 ... " This resolution was interpreted by many as U.N. authorization for military action in response to the 9/11 attacks. As a result, Congress passed S.J.Res. 23 , "Authorization for Use of Military Force," on September 14, 2001. This bill was signed by President George W. Bush on September 18, 2001, as P.L. 107-40 , and it authorized the President to use "all necessary and appropriate force against those nations, organizations, or persons he determines planned, authorized, committed, or aided the terrorist attacks that occurred on September 11, 2001, or harbored such organizations or persons.... " Operations in the region began with U.S. military forces deployed to the region on October 7, 2001. Operations began with U.S. military forces deployed to Afghanistan to combat terrorism on October 7, 2001, and designated Operation Enduring Freedom. On March 27, 2009, President Barack Obama announced a new strategy in Afghanistan and Pakistan and ordered the deployment of 17,000 troops that had been previously requested by General David McKiernan. In President Obama's "Address to the Nation on the Way Forward in Afghanistan and Pakistan" at West Point on December 1, 2009, he stated that "it is in our vital national interest to send an additional 30,000 U.S. troops to Afghanistan. After 18 months, our troops will begin to come home. These are the resources that we need to seize the initiative, while building the Afghan capacity that can allow for a responsible transition of our forces out of Afghanistan." On June 22, 2011, President Obama again addressed the American people about the way forward in Afghanistan: "We will begin the drawdown of U.S. troops from a position of strength. We have exceeded our expectations on our core goal of defeating al-Qaeda killing 20 of its top 30 leaders, including Osama bin Laden. We have broken the Taliban's momentum, and trained over 100,000 Afghan National Security Forces." As a result, U.S. forces began the withdrawal of 10,000 troops from Afghanistan. On December 28, 2014, after 13 years of combat operations, President Obama and Secretary of Defense Chuck Hagel announced the end of OEF, a conflict that claimed the lives of more than 2,200 American troops, and the beginning of a follow-on mission on January 1, 2015. A transition ceremony was held at the International Security and Assistance Force headquarters in Kabul, Afghanistan, attended by U.S. commanders and allied troops from the North Atlantic Treaty Organization (NATO). For more information, see CRS Report RL30588, Afghanistan: Post-Taliban Governance, Security, and U.S. Policy , by Kenneth Katzman and Clayton Thomas. Effective January 1, 2015, Secretary of Defense Hagel announced that the U.S. mission in Afghanistan would focus on training, advising, and assisting Afghan security forces and designated it as Operation Freedom's Sentinel. During 2015, approximately 13,000 troops, with nearly 10,000 from the United States, were deployed alongside NATO's 28 member nations and 13 partner nations for its Resolute Support Mission (RSM). RSM focused on training, advising, and assisting (TAA) the Afghan Security Institutions (ASI) and the Afghan National Defense & Security Forces (ANDSF) in order to build their capabilities and long-term sustainability. On October 1, 2015, General John F. Campbell, commander, RSM, U.S. Forces-Afghanistan/ISAF, defined the U.S. military's objectives: "U.S. forces are now carrying out two well-defined missions: a Counter-Terrorism (CT) mission against the remnants of Al-Qaeda and the Resolute Support TAA mission in support of Afghan security forces. Our CT and TAA efforts are concurrent and complementary. While we continue to attack the remnants of Al-Qaeda, we are also building the ANDSF so that they can secure the Afghan people, win the peace, and contribute to stability throughout the region." On October 15, 2015, President Obama announced that the posture of 9,800 U.S. troops in Afghanistan would remain through 2016. By the end of 2016, 5,500 troops were expected to remain in Afghanistan to support the U.S. embassy in Kabul and at bases in Bagram, Jalalabad, and Kandahar to train Afghans and focus on counterterrorism operations in the region. On August 21, 2017, President Donald Trump announced his strategy in Afghanistan and South Asia in a speech at Fort Myer, VA. He stated, "In Afghanistan and Pakistan, America's interests are clear: We must stop the resurgence of safe havens that enable terrorists to threaten America, and we must prevent nuclear weapons and materials from coming into the hands of terrorists and being used against us, or anywhere in the world for that matter." On September 2, 2018, Army General John M. Nicholson passed command of NATO's Resolute Support Mission and U.S. Forces Afghanistan to Army General Austin S. Miller during a ceremony in Kabul, Afghanistan. General Miller emphasized to coalition troops that what they are doing in Afghanistan makes their own countries and citizens safer. The "train, advise, assist" mission allows Afghan security forces to take the fight to the enemy, and to give the Afghan government the security needed to provide stability and no longer a safe haven for terrorists. See CRS Report R44853, Additional Troops for Afghanistan? Considerations for Congress , by Kathleen J. McInnis and Andrew Feickert, for more information. In mid-2002, the George W. Bush Administration began deploying U.S. troops to Kuwait. During the 107 th Congress (2001-2002), Congress debated whether to send U.S. troops to Iraq, and on October 16, 2002, H.J.Res. 114 was signed into law as P.L. 107-243 , Authorization for the Use of Military Force Against Iraq Resolution of 2002. This law authorized the President to use military force to "defend the national security of the United States against the continuing threat posed by Iraq" and "to enforce all relevant U.N. Security Council resolutions against Iraq." On November 8, 2002, the U.N. Security Council adopted Resolution 1441. This resolution found Iraq in breach of past U.N. resolutions prohibiting stockpiling and importing weapons of mass destruction (WMDs). The Hussein government in Iraq continued to be uncooperative with U.N. investigators, which heightened the situation through spring 2003. In an address to the nation on March 17, 2003, President George W. Bush gave Iraqi President Saddam Hussein and his sons a 48-hour ultimatum to leave Iraq. On March 19, 2003, President Bush announced to the nation that the early stages of military operations against Iraq had begun and designated them Operation Iraqi Freedom (OIF). On May 1, 2003, in an address to the nation, President Bush declared that "major military combat actions in Iraq have ended," yet U.S. troops remained in Iraq. A ceremony at Camp Victory in Baghdad on January 1, 2010, marked the end of the Multinational Forces-Iraq (MNF-I) and the beginning of United States Forces-Iraq (USF-I), which merged five major command groups into one single headquarters command. As General David Petraeus, head of U.S. Central Command (CENTCOM), noted, "This ceremony marks another significant transition here in Iraq. It represents another important milestone in the continued drawdown of American Forces." Troops from 30 countries have served in MNF-I since 2003. On August 31, 2010, President Obama announced that the American combat mission in Iraq had ended. A transitional force of U.S. troops remained in Iraq with a different mission: advising and assisting Iraq's security forces, supporting Iraqi troops in targeted counterterrorism missions, and protecting U.S. civilians. Effective September 1, 2010, the military operations in Iraq acquired a new official designation: Operation New Dawn. A short ceremony marked the transfer in which Army General Ray Odierno passed command of USF-I to Army General Lloyd J. Austin. On December 15, 2011, U.S. Armed Forces in Baghdad marked the official end of the war in Iraq. The Chairman of the Joint Chiefs of Staff and other top U.S. military leaders observed the official end of U.S. Forces Iraq's mission after nearly nine years of conflict that claimed the lives of nearly 4,500 U.S. troops. On the military side of Baghdad International Airport, Army General Martin E. Dempsey, Defense Secretary Leon E. Panetta, Army General Lloyd J. Austin III, commanding general of U.S. Forces Iraq, and U.S. Ambassador to Iraq James F. Jeffrey addressed U.S. and Iraqi officials and more than 150 troops and media from around the world. For more information, see CRS Report R45025, Iraq: Background and U.S. Policy , by Christopher M. Blanchard, and CRS In Focus IF10404, Iraq and U.S. Policy , by Christopher M. Blanchard. Effective October 15, 2014, the DOD designated U.S. and coalition operations "Operation Inherent Resolve" against the terrorist group the Islamic State in Iraq and the Levant (ISIL, another name for the Islamic State) along the Syrian-Iraqi border. The commander of U.S. 3 rd Army and Army Forces Central Command was designated the commander of the Combined Joint Task Force-Operation Inherent Resolve (CJTF-OIR) on October 17, 2014. Airstrikes by U.S. and coalition forces continue. As of June 30, 2017, the total cost of operations related to ISIS since kinetic operations started on August 8, 2014, is $14.3 billion and the average daily cost is $13.6 million for 1,058 days of operations. For more information, see CRS Report R44135, Coalition Contributions to Countering the Islamic State , by Kathleen J. McInnis, CRS In Focus IF10328, The Islamic State , by Christopher M. Blanchard and Carla E. Humud.

Summary:
Many wars or conflicts in U.S. history have federally designated "periods of war," dates marking their beginning and ending. These dates are important for qualification for certain veterans' pension or disability benefits. Confusion can occur because beginning and ending dates for "periods of war" in many nonofficial sources are often different from those given in treaties and other official sources of information, and armistice dates can be confused with termination dates. This report lists the beginning and ending dates for "periods of war" found in Title 38 of the Code of Federal Regulations, dealing with the Department of Veterans Affairs (VA). It also lists and differentiates other beginning dates given in declarations of war, as well as termination of hostilities dates and armistice and ending dates given in proclamations, laws, or treaties. The dates for the recent conflicts in Afghanistan and Iraq are included along with the official end date for Operation New Dawn in Iraq on December 15, 2011, and Operation Enduring Freedom in Afghanistan on December 28, 2014. Operation Inherent Resolve continues along the Syrian-Iraqi border effective October 15, 2014. For additional information, see the following CRS Products: CRS In Focus IF10539, Defense Primer: Legal Authorities for the Use of Military Forces, by Jennifer K. Elsea; CRS Report RL31133, Declarations of War and Authorizations for the Use of Military Force: Historical Background and Legal Implications, by Jennifer K. Elsea and Matthew C. Weed.