#1950 El ejército de estados unidos, famoso por sus viajes interestelares. Para empezar en el ejército actual hay tres ramas bien diferenciadas armada/tierra/aire. En Mass Effect NO porque no hay opción a "atacar sin naves espaciales" o "atacar solo con naves espaciales", hay que tomar el planeta por Tierra si o sí y para llegar allí necesitas naves y para tomarlo necesitas tropas.
The Alliance uses a modified version of the ranking system that has been used for hundreds of years. Soldiers are classified into rank-and-file enlisted personal, experienced non-commissioned officers (NCOs), and specially trained officers.
The divide between naval personnel and ground forces ("marines" ) is small. Ground units are a specialized branch of the fleet, just as fighter squadrons are. This unity of command is imposed by the futility of fighting without control of orbit; without the navy, any army is pointless. The marines, as a matter of pride, maintain some of their traditional rank titles; for example, marines have Privates and Corporals instead of Servicemen.
In ascending order of responsibility, the ranks of the Alliance are:
ENLISTED
Serviceman 3rd Class/Private 2nd Class
Serviceman 2nd Class/Private 1st Class
Serviceman 1st Class/Corporal
NCOs
Service Chief
Gunnery Chief
Operations Chief
OFFICERS
2nd Lieutenant
1st Lieutenant
Staff Lieutenant
Lieutenant Commander
Staff Commander
Captain/Major
Rear Admiral/General
Admiral
Fleet Admiral
Si vas a buscar información de Mass Effect, búscala en una fuente sobre Mass Effect y no sobre random ejército real en los siglos XX-XXI, es como si intentara equiparar rangos militares de Roma con los de ME.