Left to right: Ships with big guns..unoriginal but neccesary in a game like this..(!), weird Zeppelin
boss from the end of level one gets its come-uppance,the ubiquitous deserty bit stage..

(Left) A couple of plane sub-bosses appear while the sea-based assault from a huge
carrier continues. (Middle) You can't hit it yet! A big purple submarine boss..
(Right) .. surfaces only to be blown to bits with 'me superbomb..hehehe.