Used through the Vietnam war and beyond, until replaced by ALICE-suspenders.
Fully adjustable, with hooks for attaching to the belt, buttpack or magazine pouches. Surprisingly, these H-type suspenders are more comfortable to wear than the newer stuff!
We have these in two sizes, Regular (height under 68" or 173 cm) and Long (height 68-74" or 173-188 cm).
Used but serviceable.