Bottom line: Arthur Ashe played tennis and was a member of the ROTC (Reserve Officers' Training Corps) during his time at UCLA. After graduating, he joined the Army, where he worked as a data processor at West Point.
While in the Army, Ashe had to maintain his amateur status in tennis since there wasn’t enough time for him to be both a pro and an active Army member. As a result, when Ashe won the $14,000 first-place prize at a tournament, he could not accept it and instead just got $280, a $20 stipend for 14 days.
After being discharged in 1969, Ashe went onto a Hall of Fame career and remains the only black man to win singles titles at Wimbledon, the U.S. Open and the Australian Open.