secure area

safe and secure environment

secure a crossing

secure a gap

secure environment

secure the air

secure the battle position

secure the objective

seize and secure (key terrain)

suppress, obscure, secure, reduce, and assault (SOSRA)

gun secure spring lanyard sling

automatic secure voice communication

secure mishap site

secure the operations

secure a hit

secure a line

secure firing data

secure oneself

secure to a pier

secure

secure communications

secure supporting fires

secure an infantry commission

secure rations

establish a secure environment

maintain a secure environment

secure a proper grip

secure a tightening rod

secure the perimeter

potential danger area (trouble area)

hazard area / hazardous area

killing area / kill area

open area danger area