I'm trying to identify a game I played this weekend. The main game appeared to be a sidescrolling shooter, where you have to shoot open cages to rescue Vietnam POWs. The environment was destructible, and there was a mission select screen where you move around a little helicopter on a spherical map. The graphics are in a pixel-style, but the game appears to be very modern. It was optionally co-op, and I played it in a polycade arcade cabinet but I suspect it is not an "arcade" game. There was an online mode as well. Anyone have any clue what I played?
That's level two of Broforce.
Here is a random Youtuber playing that level: