Rank

• Field grade officers are mid-level officers holding the titles of major, lieutenant colonel or colonel. They have captains and lieutenants, as well as the enlisted ranks, under their charge, but still answer to generals.
  
  

Pay Grade

• Different ranks in the military have specific pay grades. Each pay grade is labeled with a letter and a number. The letter "O" represents commissioned officers, "E" is for enlisted individuals and "W" is for warrant officers. The numbers determine the actual pay grade. Field grade officers hold the pay grades O4 to O6.
  
  

Duties

• Field grade officers can be stationed in headquarters, such as the Pentagon, or they can act as staff officers and commanders. They also may be given the duties to command battalions and brigades. They get their orders from those above them in the chain of command, such as division commanders or command staff members.
  
  

Military Branches

• The Army, Air Force and Marine Corps have the position of field grade officer. Other military branches have different titles for equivalent positions.
  
  

Commissioned or Warranted

• Military branches are labeled either commissioned or warranted. Commissioned officers are the highest military branches. They are confirmed by the senate and are given special commissioned duties that come from the president. Field officers are considered a commissioned position. Warranted positions, on the other hand, hold warrants for their specific services and are considered specialists or experts on a specific task or duty, from helicopter pilots to human intelligence specialists.