Alliance News:

the following is not my property, give credit toBioware/EA and the writers at the Masseffect.wikia.com
Alliance Ranking System:

ENLISTED

Serviceman 3rd Class
Serviceman 2nd Class
Serviceman 1st Class
Private 2nd Class
Private 1st Class
Corporal

NCOs

Service Chief
Gunnery Chief
Operations Chief

OFFICERS

2nd Lieutenant
1st Lieutenant
Staff Lieutenant
Lieutenant Commander -Shepherds Rank in ME
Staff Commander
Captain/Major
Rear Admiral/General
Admiral
Fleet Admiral

Systems Alliance: N7
The Alliance Military Vocational Code system classifies the career path of all serving personnel. The MVC consists of one letter and one number. A soldier's MVC indicates proficiency, not rank. The letter notes career path; the number indicates level of experience, as indicated by service record, technical scores, and commendations. All 26 letters are used, and numbers run from 1 to 7. N is the letter code for Special Forces personnel.

Systems Alliance: Special Operations
Interplanetary Combatives Training (ICT) is the Systems Alliance's premier school for leadership and combat expertise. The Interplanetary Combatives Academy, sometimes called "N-School" or "the villa," recruits officers from every branch of Earth's militaries to partake in grueling courses at Vila Militar in Rio de Janeiro.

Initially, candidates train for more than 20 hours per day, leading small combat teams through hostile terrain with little sleep or food. Trainees who do well are awarded an internal designation of N1 and are invited to return. Subsequent courses - N2 through N6 - are often held off-planet and include instruction in zero-G combat, military free-fall (parachuting), jetpack flight, combat diving, combat instruction, linguistics, and frontline trauma care for human and alien biology.

The highest grade of training, N6, provides actual combat experience in combat zones throughout the galaxy. If the trainee survives these scenarios in "admirable and effective fashion," he or she finally receives the coveted N7 designation. N7 is the only ICT designation that may be worn on field or dress uniforms.

There is little shame in failing an N course - the training is so extreme that even qualifying for N1 elevates an officer to a position of respect. The universal prestige of merely attending the academy helps to restrain trainees from taking excessive risks in pursuit of higher honors.

Although ICT qualification by itself does not guarantee higher rank, those officers who are able to complete the program are typically well suited to senior leadership positions.