Irwin was born March 17, 1930, in Pittsburgh, Pennsylvania, of Scottish and Irish descent, to parents James Irwin and Elsa Mathilda Irwin (née Strebel). Irwin\'s grandparents emigrated to the U.S. from Altmore Parish at Pomeroy in County Tyrone, Ireland (now Northern Ireland) around 1859. At about the age of 12, he informed his mother about his desire to go to the Moon, letting her know that he might be the first person to do so (he ended up being the eighth). He graduated from East High School in Salt Lake City, Utah in 1947. He received a Bachelor of Science degree in Naval Science from the United States Naval Academy in 1951, and Master of Science degrees in Aeronautical Engineering and Instrumentation Engineering from the University of Michigan in 1957.\n', '
He received initial flight training at Hondo Air Base and follow-on training at Reese Air Force Base, Texas. He graduated from the Air Force Experimental Test Pilot School (Class 60C) in 1961, and the Aerospace Research Pilot School in 1963 (Class IV). Prior to joining NASA, he was chief of the Advanced Requirements Branch at Headquarters Air Defense Command. During his time in the United States Air Force he received the Air Force Distinguished Service Medal and two Air Force Commendation Medals. He also received an Air Force Outstanding Unit Citation while with the 4750th Training Wing.\n', '
Irwin was also a developmental test pilot for the Lockheed YF-12, the Mach 3 fighter-interceptor variant which preceded the SR-71 Blackbird. His first flight of that aircraft was on the day that one of his five children was born.\n', '