"The M48 Patton was in U.S. service until replaced by the M60 and served as the U.S. Army and Marine Corps's primary battle tank in South Vietnam during the Vietnam War."
The above is a true statement, but there were different versions of the M48 throughout its service life. As CapnMac says, the M48A2 was not used in Vietnam. All tanks sent there were M48A3s, which is very different from the horribly detailed, ancient Monogram M48A2 kit. I would just build it for practice and get the much better Dragon M48A3 if you want to build an accurate diorama of one in Vietnam.