Soldiers at Camp Devens in Ayer, Mass., receive R.O.T.C. instruction in swimming. This particular exercise focuses on the arm stroke technique. The photograph was taken by Sgt. Joe Hits on August 2, 1920, and the image number is 69,029.

Royalty-Free Standard Commercial licenses are granted for worldwide, non-exclusive and perpetual use, unless specifically noted otherwise. All Royalty-Free transactions are final. The Royalty-Free Standard Commercial license has no limitations and covers up to 15 users.