CAP (Combat Air Patrol): An aircraft patrol provided over an objective area, over the force protected, over the critical area of a combat zone, or over an air defense area, for the purpose of intercepting and destroying hostile aircraft before they reach their target. Combat air patrols applied to both overland and over water operations in order to protect aircraft, fixed and mobile sites on land, and ships at sea. Known by the acronym CAP, it typically entails fighters flying a tactical pattern around or screening a defended target, while looking for incoming attackers. Effective CAP patterns may include aircraft positioned at both high and low altitudes, so as to shorten response times when the attack is detected. Modern CAPs are either Ground Control Intercepts (GCI) or Airborne Warning & Control Systems (AWACS) - controlled to provide maximum early warning for either ground or air for defensive reaction and offensive operations.
VFR (Visual Flight Rules) were a term used by aircraft crew to refer to the rules of visual flying, without the use of radar, sensors, communications and navigational instruments/systems.
Casevac (Casualty Evacuation): an acronym for calling in an rescue vehicle to retrive wounded personnel.
E.T.A.: (Estimated Time of Arrival) Often used particularly in the COG navy and airforce, when inquiring how long it would take before the vessel or aircraft arrived at the given location.
E.Z.: (Extraction Zone) an acronym for military aircraft to Evac. Personnel, mainly civilians & equipment, but could also mean soldiers, Government Officials, & other high ranking individuals.
FUBAR (Fucked Up Beyond All Recognition) an acronym meaning the situation was screwed and also said if needed to get out of there. An example of this was when Cpl.Damon Baird used it when KR Two-Four`s crash site when Gus, and Baird helped the survivors, he radioed in to Marcus saying "this whole situation is FUBAR".
KIA: (Killed In Action): example of this would be when Marcus informed Control KR Five-Four and Charlie Nine were down after arriving too late to help them in what was left of Ilima City.
L.Z.: (Landing Zone) is an abbreviation and term that mainly references to a specific spot for a vehicle, such as a helicopter, landing on the specific spot for either deploying and/or landing forces, as well as and the main pick-up of personnel.
MEZ: (Marinetime Exclusion Zone) The zone around a navy base, island, or shore line that is offlimits to all vessels without clearance.
MIA: (Missing In Action): an acronym for a soldier or other personnel that have gone missing out in the field of battle.
M.O.U.T.: (Military Operations in Urban Terrain) a COG military term for urban combat.
POW: (Prisoner Of War) a captured combatant from the opposition in a war.
RV: (Rendezvous): an acronym meaning to meet at an agreed time and place.
SOP: (Standard Operating Procedure/Standing Operating Procedure) Both were used in a variety of different contexts: healthcare, education, industry, military, etc. In military terminology it is used to describe a procedure or set of procedures to perform a given operation or evolution or in reaction to a given event. There is a popular misconception that SOPs are standardized. However, the very nature of an SOP is that it is not standardized across a large military element (such as a corps or division) but rather describes the unique operating procedure of a smaller unit (such as a battalion or company) within that larger element. That the operating procedure in question is said to be "standing" indicates that it is in effect until further notice, at which time it may be amended or dissolved.
En-COG: (Coalition of Ordered Governments Engineers) this covered the combat engineers that served the COG.
COGDRA (Coalition of Ordered Governments Defense Research Agency) The COGDRA was the acronym used to refer to the DRA, the Defense Research Agency. The DRA studied, researched and even developed advanced military technology for the COG Armed Forces.
SNC: (Sera News Channel) another major news network, rival to CNS.
UIR: (Union of Independent Republics) was the main antagonist of the COG during the Pendulum Wars.
EM (Emergency Management) was an organization of the COG Federal Government responsible for large-scale emergencies that erupted during a chaotic period. They provided medical services, evacuated military personnel and civilians, provided immediate support and relief in an area and reported events to other support organizations.
VNB (Vectes Naval Base) was a COG naval base located on Vectes Island. It was supported by the town of Pelruan on the other side of the island. After E-Day, it was cut off from the rest of Sera, until the remnant of the COG arrived to island seeking refuge.
EBA (East Barricade Academy) was a section of Ephyra. EBA housed the R.L Sterling Conservatory, a military academy and Adam Fenix's Estate.
CO: (Commanding Officer), the officer in command of a military unit, having significant responsibilities, duties and powers.
NCO: (Non-Commissioned Officer) referred to ranks as corporal and sergeant, someone who had obtained their authority by promotion from the lower ranks.
JAG: (Judge Advocate General) referred to a person who was the head of a branch of the COG military concerned with military justice and military law. 
LAV: (Light Armored Vehicle) was a medium armored vehicle designed, used and deployed on the battlefield for direct combat situations including supporting and escorting friendly forces, as well as general combat against enemy forces.