Jack Kramer was a pitcher with the Browns from 1939-41, spent most of two years in the service, and returned full time with the Browns from 1944-47.
From his SABR Bio:
With World War II on in full force, Kramer spent 1942 working as a shipfitter at the Delta Shipyard in New Orleans where he was able to pitch an occasional Sunday semipro game. Then he enlisted in the Navy in January 1943 and volunteered for the rigorous Seabee training at Camp Peary near Williamsburg, Virginia. His sinuses, which had first been a problem in Toledo in 1940, kicked up with all the plunging in and out of water in Virginia’s marshlands that was required of him, landing him in the post hospital. After a month’s stay there the Navy gave him an honorable discharge on May 14 and he headed home to New Orleans to further recuperate.
Jack Kramer | SABR
Photo dated 1944