from a point on the East Coast of Vietnam at the juncture of Vietnam with China southeastward to 21 degrees north latitude, 108 degrees, 15 minutes longitude; then southward to 18 degrees, north latitude, 108 degrees, 15 minutes east longitude; then southward to 17 degrees, 30 minutes north longitude, 111 degrees east longitude; then southward to 11 degrees north latitude, 111 degrees east latitude; then southward to 7 degrees north latitude, 105 degrees east latitude; then westward to 7 degrees north latitude, 103 degrees east latitude; then northward to 9 degrees, 30 minutes north latitude, 103 degrees east latitude; then northeastward to 10 degrees, 15 minutes north latitude, 104 degrees, 27 minutes east latitude; then northward to a point on the West Coast of Vietnam at the juncture of Vietnam and Cambodia. The VSM may be awarded posthumously. The Vietnam Service Medal is retroactive to 1 July 1958 and supersedes and replaces the Armed Forces Expeditionary Medal which was issued for initial operations in South Vietnam, Laos, and Cambodia from that date through 3 July 1965. Defense Department regulations do not permit the simultaneous presentation of both the Vietnam Service Medal and the Armed Forces Expeditionary Medal, for the same period of service in Vietnam, however the AFEM may be exchanged for the VSM upon request from a service member. Veterans of the Vietnam War may exchange the AFEM for the VSM and have military records updated to reflect the difference by contacting the National Personnel Records Center, which is the current agency that provides record corrections reflecting an AFEM conversion to the Vietnam Service Medal. Though the Mayaguez incident is often referred to as the last battle of the Vietnam War, U.S. military personnel who participated in it are not eligible for the Vietnam Service Medal by virtue of participating that battle alone, as the eligibility period for the medal ended in April 1975, a few weeks before the battle took place. Instead of the VSM, the AFEM is authorized for military members who participated in that battle. A congressional bill was introduced in 2016 to award veterans of the Mayaguez battle the VSM, but the bill was never voted out of committee, effectively ending it. South Vietnam also issued its own service medal for the Vietnam War, known as the Republic of Vietnam Campaign Medal. This is a separate military award which was accepted by the U.S. Congress