This is John Swiderski's second game for the Atari 5200 (the first was Haunted House II 3-D). In Combat II Advanced, four players (or fewer) fight tanks, helicopters, submarines, and jets. There are 4 playing fields for each type of military vehicles.
The game is said to be based on an Atari arcade game. By deduction it turns out that these are Vindicators.