Amphetamine was given to Allied bomber pilots during World War II to sustain them by fighting-off fatigue and enhancing focus during long flights.   During the Persian Gulf War , amphetamine became the drug of choice for American bomber pilots, being used on a voluntary basis by roughly half of . Air Force pilots.  The Tarnak Farm incident , in which an American F-16 pilot killed several friendly Canadian soldiers on the ground, was blamed by the pilot on his use of amphetamine.  A nonjudicial ( UCMJ Article 15 ) . Air Force hearing rejected the pilot's claim.