There are some commonly-used abbreviations to mean whether you're attacking from air/ground against air/ground. These include: * A2A - an air-to-air attack...as in a warhawk killing another warhawk with missiles * A2G - an air-to-ground attack...as in a warhawk killing troops or a tank with a TOW * G2A - a ground-to-air attack...as in troops shooting warhawks with RPGs or turrets