The U.S. Army tried the long-range gun again in the 1960s with the M107 175 mm gun ; although a high-maintenance item , which after a rash of cracked barrels was removed from service with the U.S. , the M107 was used extensively in the Vietnam War and proved effective in artillery duels with the North Vietnamese forces .
The M107 was used in the Vietnam War and proved effective in artillery battles with the North Vietnamese forces .