Vietnam Era US Army tropical summer dress uniform shirt.
These shirts were issued by the US Army to the South Korean Army
Many but not all have rank of the ROK (Republic of Korea) Special Warfare Command.
Typical Label
SHIRT, MEN'S SHORT SLEEVE
ARMY TAN 445, DURABLE PRESS
DLA100-80-C 2802
50% POLYESTER 50% COTTON
MARTIN MGF CO. INC