three brigades abreast

two brigades abreast

brigades in echelon

column of brigades

field artillery brigades (FABs)

abreast

keep abreast of the (battle) situation

stay abreast of the (battle) situation

advance with two battalions abreast

line abreast formation

keep abreast of the situation

three-dimensional (3D) point position

3CF (three column format 1. Factor - What; 2. Deduction, Analysis / Implication – Why; 3. Output - So What)

one-(two-, three) dimensional steady flow

three flow turbojet engine

three-dimensional virtual mass moment of inertia

non-retractable three-leg landing gear

three-blade tail rotor

three-component balance

three-dimensional element

three-man crew

three-point landing

three-pointer electric indicator

three-pointer inductive indicator

velocity potential equation for three-dimensional gas flow

three-dimensional flow

description of object geometry in three-dimensional space

three-blade propeller

last three

precision three-site radar

three-pronged offensive

three-point resection

proportional–integral–derivative controller (PID controller / three-term controller)