American soldiers during the Battle for the Ardennes. Note the soldier on extreme right is holding a BAR (Brownie Automatic Rifle), the one next to him a "Grease Gun" (.45 caliber submachine gun). The other two have an M1 Garand semi-automatic rifle (clip of 8 .30 caliber bullets) with bayonette; December 1944-January 1945. 
Ardennes is a region in southeast Belgium that extends into Luxembourg, Germany and France.  It's rugged terrain encompasses rolling valleys, meandering rivers, extensive caves and dense forests crisscrossed with hiking paths.

Combat soldiers

Two soldiers pose with ammo belts and M1 rifles

Ammo belts

Look at the bullet hole on his helmet... At the angle the Japanese bullet went in, but did not seem like it came out. Either way, - he is one lucky GI.; Location - one of the Pacific Islands - judged by the palm trees in the background. (Privately taken photo)