ACOG: Advanced Combat Optical Gunsight by Trijicon.

AUC / ACU: Army Universal Camouflage /Army Combat Uniform.  The former is a digital pattern that is used on the latter. 
BUIS:  Back Up Iron Sight, usually in either fixed or folding configurations that can be added or removed on a host firearm.

CIRAS: Combat Integrated Releasable Armor System by Eagle Industries.

CQC: Usually stands for Close Quarter Combat. However, CQC stands for Close Quarter Concealment in the case of the BlackHawk SERPA CQC Holster.

EOD: Explosive Ordnance Disposal.

E-SAPI: Enhanced Small Arms Protective Inserts.

FB: Fort Bragg, a designation for pouch designs by Eagle Industries that were made for units at Ft. Bragg. "FB" now refers more to the kydex insert found in Eagle gear.

GP: General Purpose.

QD: Quick Detach.

MULTICAM®: MultiCam® is a single camouflage pattern designed to help the wearer hide in varied environments, seasons, elevations, and light conditions. The pattern was developed by Crye Precision with the U.S. Army Soldier Systems Center to replace the out-dated 3-color desert and Woodland patterns.

PALS WEBBING: Pouch Attachment Ladder System, is a grid of 1" nylon webbing strips used to attach smaller pouches and equipment onto load-bearing platforms such as backpacks and plate carriers. Uses Malice Clips, Blackhawk Speed Clips or Grimloc D-rings to attach the equipment. The term "Pals Webbing" is used interchangeably with "MOLLE".

PICATINNY: The Picatinny rail, also referred to as MIL-STD-1913 rail is a standardized mounting platform used on firearms to mount tactical scopes, lights, bipods and other accessories.

PVS-14: Passive Vision System- Model 14, US Military designation for a Night Vision Monocular.

SAS: Special Air Service, a British Special Operations Unit, used by Eagle Industries to identify designs that have roots in SAS gear.

SAW: Squad Automatic Weapon, a belt-fed 5.56mm Machine Gun used by the US Military, known also as FN MINIMI or M-249.

MALICE CLIPS:  Injection molded, heavy duty, reusable connecting clips that are designed to attach modular pouches to MOLLE/PALS style equipment- designed and manufactured by Tactical Tailor.

MOLLE: MOdular Lightweight Load-carrying Equipment (pronounced MOLLY). See Pals Webbing.