Like WW2 US Garand clip pouches, but no method to slip them over a belt or attach suspenders. It is possible that these bandoliers were manufactured by CISO due to similarity in materials with other known CISO products and their usage with Thailand [1], a US ally during the Vietnam War.
Pouch:
Has WW2 style “Lift the Dot” fasteners. The pouches appear to be sized for 20 round M16 magazines (see usage photos below).
Strap:
Tips appear to be sealed with adhesive to prevent fraying.
Buckle:
US ladder style buckle.
Usage Photos:
These bandoliers were used by Thai forces and their advisors during the “Secret War” in Laos during the US Vietnam War.
Thailand (Unity Program):
For more information about the Unity Program and Thai Forward Air Guides: https://www.cia.gov/resources/csi/static/Secret-Warriors-Thai-AirGuides.pdf (PDF Mirror)
Raven Forward Air Controller (Laos, US Advisor):