well long hai is pretty much as inland as you can get and that is where i helped train the cambodian army. i cycled 2 companies, and from the book who's who from uitg/fank an article written by alan dawson at the time states "
"
About 300 of the elite Special Forces
troops, aided by other hand-picked officers
with Airborne and Ranger training, have instructed
30,000 Cambodians at three
American-run camps in South Vietnam in
the past 18 months."