Vietnam era chopper lands at a base, soldiers come running across the field towards it. Suddenly the guy in the sidegunner seat (officer of some sort) starts gunning them down. Chopper takes off and continues to gun down all the people on the ground. This was the point i was sent to bed as a child… its most likelly a tv movie and aired in 80s so made in 70s -80s?
Omg…!!! Thank you…!!!
You are most welcome, enjoy your film. 
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“The Last Grenade” (1970)
You can watch it on YouTube here, the scene you are describing is near the beginning of the movie:
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