a saucer-shaped uniform cap with a visor, standard in the U.S. Army and Air Force.
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How to use service cap in a sentence
When not in the field, the service cap is worn instead of the campaign hat.Manual for Noncommissioned Officers and Privates of Cavalry of the Army | War Department.
With an angry gesture Freddy Farmer changed his rain slicker to his other arm, and pushed his service cap to the back of his head.Dave Dawson at Truk | Robert Sydney Bowen
He could see, though, that the hair below the service cap was straw-colored, and he guessed that the eyes were sky blue.Dave Dawson at Truk | Robert Sydney Bowen
"Sorry it took so long, boys," he said, and reached for his service cap.Dave Dawson at Casablanca | Robert Sydney Bowen
There was a crack, and a shriek near my head, and my service cap was whisked off.How I Filmed the War | Lieut. Geoffrey H. Malins