More fun for me to ramble nonsense.
The first one appears to be a flying allied unit probably its going to be anti armor because the tubes could be missiles,or it could be for epsilon.
the second appears to have a contraption similiar to the bass cannon,it too would be allied as it doesnt seem to have the other faction's style.
the third could be a chinise submarine,if i remember correcly china doesnt have a unique navy unit.
The fourth one is for epsilon as the design is all over the place,it seems to have the antares cannon in the front of it.