The Dutch Historian

German soldiers having mounted a 37 mm Pak 36 on an Infanterie Schlepper UE 630 (f) (originally the French Renault UE Chenillette). Note the wooden stick that functions as a brake to prevent the gun from falling off the tank. Location and date unknown.

A United States Army Soldier shows a captured World War Two era M1 Garand, which he found during the search of an Insurgents home, Western Muqdadiyah, Iraq 2007.
The M1 is a semi-automatic rifle adopted by the US Army as their official service rifle in 1936. It served the US army throughout World War II, the Korean War, and even during Vietnam. But as you can see, it has been used by various other countries too.