secure environment
безпечна обстановка; безпечне середовище; умови безпеки
безпечна обстановка; безпечне середовище; умови безпеки
contemporary operational environment / contemporary operating environment (COE)
operational environment (OE) (obsolete, see `operating environment`)
seize and secure (key terrain)
suppress, obscure, secure, reduce, and assault (SOSRA)
gun secure spring lanyard sling