Spring training in New York.
During WWII it was thought unwise to hold spring camp anywhere near the eastern coast. After all, German U-boats where known to hug the American coastline in an attempt at disrupting supply lines to the European front. So, the Dodgers spent several March's in Bear Mountain, NY.
Featured above is an International News press photo, dated March 20, 1945, of seven members of the Brooklyn Dodger pitching staff showing off their follow-through at the preseason facility. (eBay Auction Link) Per the descriptor on the reverse:
DODGERS PITCHING STAFF.