This is a 1 loop clear of Green Beret, also known as Rush'n Attack, made by Konami and relesed in arcades in 1985.
This was maybe the first videogame I ever saw for the home environment. At the age of 6, I was at a friends house and he had a Commodore 64. I remember we played this game and Impossible Mission.
In this game you're sent into battle to rescue the P.O.Ws and you're with nothing but a knife. You can kill certain enemies to get a more powerful weapon like a flamethrower, hand grenade or a rocket launcher.