be in the field

працювати оперативником (про розвідку / термін спецслужб); перебувати на озброєнні (у військах); перебувати в польових умовах; перебувати в діючій армії

field officer (field-grade officer / senior officer)

combat field pack, field pack

air support field pack, field pack air support, airborne / para (air support) / Pathfinder Bergen

combination field and field-off duty uniform

acoustic field

antiamphibious minefield  (anti-amphibious mine field)

army in the field

command field exercise (CFX)

crisis medicine field demonstration

fast-moving battle (field)

FH70 field howitzer (towed / self-moving)

field ambulance

field and command post exercise

field army

field army signal brigade

Field Artillery (FA)

field artillery delivery system

field artillery howitzer battalion

field cap

field commander

field communications wire

field court-martial

field craft

field depot

field dressing

field environment

field equipment

field exercise (FX)

field expedient

field expedient munitions

field firing

field firing range