Fun Fact: Enemy soldiers could be run over instead of being shot. They would squash like bugs, and it was awesome.
Jackal was like a vehicle-based version of Contra, or possibly Commando. Players controlled a two-man jeep from an overhead view. The machine gun always shot towards the top of the screen while missiles were fired in the direction the jeep was facing.
Each level had a prisoner of war camp from which to rescue captured soldiers, who were then dropped off at a landing point and a waiting evacuation chopper. This was followed by a boss battle and moving on to the next level.
Jackal's co-op gameplay was a lot of fun. Konami was an old hand at these types of games by 1988, and everybody knew it.