можливі варіанти дій противника (див. ECOA)
open burning and open detonation (OBOD) (= open-pit)
Enemy Courses of Action (ECOA)
retraining and skills enhancement courses
resettlement courses
coastal artillery gunnery staff courses
open country / open ground
lines open to the enemy
overwhelm an enemy / overwhelm the enemy
break-open
open arrest
open attack
open barrel sight
open boat
open column
open emplacement
open fire
open flank
open formation
open hostilities
open order
open out
open position
open range
open route
Open Skies Treaty
open source intelligence (OSINT)
open submarine warfare
open time
open weapon emplacement
open wire
open work
open wound