An early Vietnam War movie, with Major Burt Lancaster lamenting that it's not a real war as a bunch of American "advisors" try to hold a strategic fort despite the efforts of the Viet Cong.
Routinely directed in TV movie style by Ted Post with some reasonable action scenes, but with a good script that includes a great anecdote about oral sex delivered by Lancaster with the punchline "I saluted".
All the actors follow their lines and play out a fairly average plot with vigour. Sadly there's not much more they can do as this is clearly Lancaster's film and he hogs every scene into which he enters.