I received one for my service in Vietnam in 1971-72.
I’m 71 years old and one of the youngest recipients. There are only a few stragglers left who served in that war who aren’t drawing Social Security yet. Other than for service during the two days of Operation Frequent Wind in April, 1975, the last qualifying action for the Vietnam Service Medal took place on 28 January, 1973. It is highly unlikely that anyone who joined the military during or after 1972 would have been legitimately awarded the medal.