Marines, at Iwo Jima, used 60mm mortar to help secure the island for the Allies:
From the viewpoint of Marine company commanders, having their own "artillery," in the form of 60mm mortars, was a very satisfying matter. A 60mm mortar crew is at work, in a natural depression, lobbing round after round at enemy positions.
USMC photo 142845, featured in Closing In: Marines in the Seizure of Iwo Jima, by Col. Joseph H. Alexander, U.S. Marine Corps (Retired), at page 43. Part of the Marines in World War II Commemorative Series.