Question: USS Michael Murphy is a ship named after an officer from which branch of the United States military?
Context: USS "Blue Ridge" (LCC-19) is the lead ship of the two "Blue Ridge"–class command ships of the United States Navy, and is the command ship of the United States Seventh Fleet.  Her primary role is to provide command, control, communications, computers, and intelligence (C4I) support to the commander and staff of the United States Seventh Fleet.  She is currently forward-deployed to U.S. Navy Fleet Activities, Yokosuka in Japan, and is the third Navy ship named after the Blue Ridge Mountains, a range of mountains in the Appalachian Mountains of the eastern United States.  "Blue Ridge" is the oldest deployable warship of the U.S. Navy, following the decommissioning of  in Pearl Harbor on 14 August 2014.  "Blue Ridge", now the U.S. Navy's active commissioned ship having the longest total period as active, flies the First Navy Jack.  "Blue Ridge" is expected to remain in service until 2039. Isaac Campbell Kidd (March 26, 1884 – December 7, 1941) was an American Rear Admiral in the United States Navy.  Kidd was killed on the bridge of USS "Arizona" during the Japanese attack on Pearl Harbor.  He was the father of Admiral Isaac C. Kidd, Jr. He was a posthumous recipient of his nation's highest military honor—the Medal of Honor.  The highest ranking casualty at Pearl Harbor, he became the first U.S. Navy flag officer killed in action in World War II as well as the first killed in action against any foreign enemy.  A "Fletcher"-class destroyer , "Kidd" (DD-661) , was commissioned in his honor on April 23, 1943.  The second ship named after him, "Kidd" (DDG-993) , lead ship of four "Kidd"-class destroyer s, was commissioned on March 27, 1981.  An "Arleigh Burke"-class guided missile destroyer, "Kidd" (DDG-100) , was the third ship named after him and was commissioned on June 9, 2007. USS "Michael Murphy" (DDG-112) is the 62nd ship of the "Arleigh Burke"-class destroyer s.  She is named for Medal of Honor recipient Michael P. Murphy (1976–2005).  Her contract was awarded on 13 September 2002 to the Bath Iron Works and Vice Admiral John Morgan, the first commanding officer of "Arleigh Burke" , made the first cut of steel.  DDG-112 was named "Michael Murphy" by Secretary of the Navy, Donald C. Winter on 7 May 2008 and her keel was laid down on 18 June 2010.  The ship was christened on 7 May 2011, Murphy's birthday, by her sponsor Maureen Murphy, Michael Murphy's mother. USS "Dwight D. Eisenhower" (CVN-69) (""Ike"") is a nuclear-powered aircraft carrier currently in service with the United States Navy.  Commissioned in 1977, the ship is the second of the ten "Nimitz"-class aircraft carrier s currently in service, and is the first ship named after the 34th President of the United States, Dwight D. Eisenhower.  The vessel was initially named simply as USS "Eisenhower", much like the lead ship of the class, "Nimitz" , but the name was changed to its present form on 25 May 1970.  The carrier, like all others of her class, was constructed at Newport News Shipbuilding Company in Virginia, with the same design as the lead ship, although the ship has been overhauled twice to bring her up to the standards of those constructed more recently. USS "Essex" (LHD-2) is a United States Navy "Wasp"-class amphibious assault ship built at what is now Huntington Ingalls Industries in Pascagoula, Mississippi, and commissioned on 17 October 1992 while moored at North Island NAS beside USS "Kitty Hawk" .  It is the fifth ship named for Essex County, Massachusetts.  "Essex" served as the command ship for Expeditionary Strike Group Seven until replaced by USS "Bonhomme Richard" on 23 April 2012.  "Essex" collided with USNS "Yukon" in May 2012. Michael Patrick "Murph" Murphy (May 7, 1976 – June 28, 2005) was a United States Navy SEAL officer who was awarded the U.S. military's highest decoration, the Medal of Honor, for his actions during the War in Afghanistan.  He was the first member of the U.S. Navy to receive the award since the Vietnam War.  His other posthumous awards include the Silver Star Medal (which was later upgraded to the Medal of Honor) and the Purple Heart. USS "The Sullivans" (DD-537) is a "Fletcher"-class destroyer .  She is a United States Navy ship named in honor of the five Sullivan brothers (George, Francis, Joseph, Madison, and Albert) aged 20 to 27 who lost their lives when their ship, USS "Juneau" , was sunk by a Japanese submarine during the Naval Battle of Guadalcanal on 13 November 1942.  This was the greatest military loss by any one American family during World War II.  She was also the first ship commissioned in the Navy that honored more than one person. USS "Lyndon B. Johnson" (DDG-1002) will be the third and final "Zumwalt"-class destroyer built for the United States Navy.  The contract to build her was awarded to Bath Iron Works located in Bath, Maine, on 15 September 2011.  The award, along with funds for the construction of USS "Michael Monsoor" , was worth US$1.826 billion.  On 16 April 2012, Secretary of the Navy Ray Mabus announced the ship would be named "Lyndon B. Johnson" in honor of Lyndon B. Johnson, who served as the 36th President of the United States from 1963 to 1969.  Johnson served in the Navy during World War II, when he was awarded the Silver Star, and ultimately reached the U.S. Naval Reserve rank of commander.  DDG-1002 is the 34th ship named by the Navy after a U.S. president. USS "The Sullivans" (DDG-68), an "Arleigh Burke"-class Aegis guided missile destroyer, is the second ship of the United States Navy to be named for the five Sullivan brothers – George, Francis, Joseph, Madison, and Albert Sullivan, aged 20 to 27 – who lost their lives when their ship, USS "Juneau" , was sunk by a Japanese submarine in November 1942 in the Naval Battle of Guadalcanal (the first ship named for them was  ).  This was the greatest military loss by any one American family during World War II.  In 2000 a group affiliated with Al-Qaeda attempted to attack and destroy "The Sullivans", but the attackers' boat sank before the attack could be carried out. USS "Knox" (DE-1052/FF-1052) was the prototype and lead ship in a new class of destroyer escorts in the United States Navy.  She was named for Commodore Dudley Wright Knox and was the second US Navy ship named USS "Knox".
Answer: U.S. Navy