UNITED STATES MILITARY PAYMENT CERTIFICATE, FIVE DOLLARS, "MEDUSA"
M886 $5.00, Series 641, was issued in 1965 and circulated until October 1968, VF to XF, few small rust holes
One of the most popular types for Military note collectors is the "Medusa" note. These were used in Vietnam during the Vietnam war.
These certificates were currency issued to US servicemen overseas, so that United States currency would not destabilize the local economies.