Domination:- Hold areas to gain points areas are chained together in a network so you can "cut off" areas. (PVP Team)
Hamburger Hill: Hold an area for points team with ost points at end wins (PvP Team)
Team Death Match: Spawns can be limited or infinate (PvP Team)
Deathmatch: Spawns can be infinate or limted (PvP Solo)
COOP: Play the campain with up to 3 other people If the Leader dies its game over (PvE)
OGR COOP: Original Ghostrecon Coop, up to 12 (i think) verse loads of bad guys (PvE)
thats the ones i usually play and can remember. On top of the above Weaposn in every mode can be either bought (CS style which i hate) or selected as required. Severs can also limit the weapons pool, (No Explosives for example)