Context : The President of the United States of America, authorized by Act of Congress, July 2, 1926, takes pleasure in presenting the Distinguished Flying Cross to First Lieutenant (Air Corps) Richard A. Knobloch, United States Army Air Forces, for extraordinary achievement as Co-Pilot of a B-25 Bomber of the 1st Special Aviation Project (Doolittle Raider Force), while participating in a highly destructive raid on the Japanese mainland on 18 April 1942. 
Subject : Richard A. Knobloch 
Relation : military branch
What military branch is Richard A. Knobloch?