Yes.
And most of his movies reflected him as a person and his life. Which made them doubly believable. He was a tough hombre alright.
AUDIE MURPHY WAS AN UNDERCOVER AGENT FOR THE FBI
AND THE LOS ANGELES DISTRICT ATTORNEY’S
ORGANIZED CRIME DIVISION FOR 19 YEARS. HE WAS
KILLED WHILE ON ASSIGNMENT INVESTIGATING THE CARLOS
MARCELLO ORGANIZED CRIME FAMILY OF LOUSIANA.
In 1949, Murphy wrote his WW2 autobiography, "To Hell and Back", that was later bought by Universal for filming in 1955. While my Dad abhorred WW2 movies, this was one that he saw and commended. As a mustang himself (enlisted to officer), he focused upon one scene in the movie that rang so very true to him. Murphy, playing himself, is the very picture of a tough platoon leader, and when a fresh-from-the-states 'chick' joins the platoon, Murphy has no kindness for him.
When this newbie asks another old timer about this, he gets the veteran's answer of "It is too soon!" WW2 infantry is a small group of expendable soldiers that die all too quickly. A too-quick friendship is a danger, especially with a newby, as they don't have the instincts to save themselves AND their platoon mates. As the leader, Murphy demonstrated that attitude, as he was protecting his long time comrades and would wait to see if this new guy could learn the rules fast enough to stay alive!