Question: When was the United States Army Colonel died who wrote the Day After Roswell?

Context paragraphs:
Larry Wortzel: Dr. Larry M. Wortzel (born 1947) is an eight-term Commissioner of the U.S.-China Economic and Security Review Commission of the United States Congress.  A 32-year military veteran, he was a U.S. Army colonel, director of the Strategic Studies Institute of the United States Army War College, and vice president of The Heritage Foundation.  He was a military attaché at the U.S. Embassy in Beijing, and witnessed the Tiananmen Massacre in 1989.  He is considered one of the United States' top experts on China and its military strategy.

Walter Haut: 1st Lt. Walter Haut (June 2, 1922 – December 15, 2005) was the public information officer (PIO) at the 509th Bomb Group based in Roswell, New Mexico during 1947.  Early on July 8, 1947 he was ordered by the base commander, Colonel William Blanchard, to draft a press release to the public, announcing that the United States Army Air Forces had recovered a crashed "flying disc" from a nearby ranch.  The press release garnered widespread national and even international media attention.  The U.S. Army Air Force retracted the claim later the same day, saying instead that a weather balloon had been recovered.  Haut also received some criticism and ridicule in the nation's press for putting out the original press release.  The series of events eventually became known as the Roswell UFO Incident.

Ernest Graves Jr.: Ernest Graves Jr. (born July 6, 1924) was a United States Army officer who attained the rank of lieutenant general.  His father, Ernest Graves Sr., was a U.S. Army colonel and coach of the Army Black Knights football team at the United States Military Academy.

Philip J. Corso: Philip James Corso (May 22, 1915 – July 16, 1998) was an American Army officer.

The Day After Roswell: The Day After Roswell is an American book about extraterrestrial spacecraft and the Roswell UFO incident.  It was written by United States Army Colonel Philip J. Corso, with help from William J. Birnes, and was published as a tell-all memoir by Pocket Books in 1997, a year before Corso's death.  The book claims that an extraterrestrial spacecraft crashed near Roswell, New Mexico, in 1947 and was recovered by the United States government who then sought to cover up all evidence of extraterrestrials.

James Hagan (Confederate colonel): James Hagan (June 17, 1822 – November 6, 1901) was a United States Army captain during the Mexican-American War and a Confederate States Army colonel during the American Civil War (Civil War).  He was a prosperous businessman and planter at Mobile, Alabama between the wars.

USS Higgins: USS "Higgins" (DDG-76) is a Flight II "Arleigh Burke"-class destroyer in the United States Navy.  She is named for Colonel William R. Higgins.  President George Bush awarded Colonel Higgins the Presidential Citizen’s Award two years after the colonel died.  Two years later the president named the ship, which was to be built as the 26th destroyer of her class, after Colonel Higgins.  USS "Higgins" was the 15th ship of this class to be built at Bath Iron Works in Bath, Maine, and construction began on 14 November 1996.  She was launched and christened on 4 October 1997.  On 24 April 1999 she was commissioned during a ceremony at Port Everglades, Florida.

Whitfield Jack: George Whitfield Jack, Jr., known as Whitfield Jack or Whit Jack (July 10, 1906 – April 23, 1989), was a United States Army colonel in World War II, a major general of the United States Army Reserve, and a prominent attorney in his native Shreveport, Louisiana.

Michael John Hurdzan: Michael John Hurdzan (born September 11, 1943) is an American golf course architect, author, and a retired United States Army Colonel, who served with the United States Army Special Forces (Green Berets).  He is a member and past president of the American Society of Golf Course Architects (ASGCA), who is noted for designing and renovating many golf courses and clubs, including U.S. Open golf courses.

William B. Caldwell III: William B. Caldwell III (July 20, 1925 – March 17, 2013) was a United States Army general who served 32 years in the U.S. Army and retired as the Fifth U.S. Army commanding general at Fort Sam Houston in San Antonio.  A combat veteran of wars in Korea and Vietnam, he was awarded the Silver Star on three separate occasions for gallantry and heroism under fire.  Coming from a long line of soldiers, his great-great-great-great grandfather, Thomas Maze, fought in the Revolutionary War, his grandfather served in the Union Army during the Civil War, his father was an Army Colonel during World War II retiring after 37 years of military service, and his son is a retired lieutenant general with tours in Iraq and Afghanistan.

Supporting paragraphs: The Day After Roswell Philip J. Corso
Answer: July 16, 1998