He had moved to Montgomery, Alabama, to work on the unsuccessful U.S. Senate campaign of Republican Winton M. Blount.[36][37] In 1972, Bush was suspended from flying for failure to take a scheduled physical exam.[38] He was honorably discharged from the Air Force Reserve on November 21, 1974.[39]
Bush remains the most recent president to have served in the military.[40]

Business career
Main article: Professional life of George W. Bush
In 1977, Bush established Arbusto Energy, a small oil exploration company, although it did not begin operations until the following year.[41][42] He later changed the name to Bush Exploration. In 1984, his company merged with the larger Spectrum 7, and Bush became chairman. The company was hurt by decreased oil prices, and it folded into HKN, Inc.,[43] with Bush becoming a member of HKN's board of directors. Questions of possible insider trading involving HKN arose, but a Securities and Exchange Commission investigation concluded that the information Bush had at the time of his stock sale was not sufficient to constitute insider trading.