It’s the last upgrade of this body armor series, replace snap and zipper with Velcro fastener, and formally assigned a nomenclature “M-1969” or “M-69”.
Use the same FSN of Gen II version.
In 1970, RVNAF (Republic of Viet-Nam Armed Force) was issued US made body armor in same design but much smaller, this kind of body armor only in Medium and Small size.
Stock Number Reference:
Armor, Body Fragmentation Protective, w/ ¾ Collar, M-69