212th Planetary Defense Group
Active:	13 March 2174 CE - 9 June 2183 CE
Organization:	Systems Alliance
Affiliation:	Systems Alliance Marine Corps
Branch:	Dog Squad Able Squad Panther Squad Charlie Squad Bravo Squad
Type:	Battalion
Role:	Colonial guard supplementary defense force
Size:	500 troops
Part of:	2nd Frontier Division
Headquarters:	Colony Euphoria, Eden Prime
Nickname(s):	Hell for the Unaccomplished 212
Engagements:	Eden Prime War Battle of Eden Prime
Commanders:	Mjr. Salvatore Mankins
Notable:	Ashley M. Williams Gerald Donkey † Nirali Bhatia † Stephen Banner † Salvatore Mankins † Jeremy Bates †

The 212th Planetary Defense Group, often simply called the 212, was a Systems Alliance Marine Corps force attached to the 2nd Frontier Division commanded by Major Salvatore Mankins. The unit was trained at the Systems Alliance Marine Corps Barracks on New Constantinople, where it was later stationed on Eden Prime following the Skyllian Blitz. The 212th PDG was often called hell for the unaccomplished, as the PDG was a planetary garrison, and saw very little fighting: Ashley Williams, due to her family's blacklisting in the military, was purposefully stationed there for this very reason. For this very reason, the 212 was completely ill-equipped and unprepared for when the geth attacked Eden Prime in 2183 CE, and were wiped out in the ensuing battle, with Gunnery Chief Williams being the only survivor of the 500 strong unit.