main crossing

переправа головних сил

level-crossing = (амер.) grade crossing

main defense area (line) / main defensive position

main tank/ main fuel tank

main gear box / main rotor transmission

main rotor transmission / main gear box

main-rotor head / main-rotor hub

main-rotor hub / main-rotor head

assault crossing

assault crossing site

assault stream-crossing equipment

border crossing arrangement

border crossing point (BCP) / station

controlled crossing point

crossing equipment

crossing equipment/means

crossing target

crossing-in-force (from the march)

deliberate (stream) crossing

force a crossing

hasty gap crossing

hasty stream crossing

light stream-crossing equipage

opposed stream crossing

secure a crossing

standard crossing equipment

uncontrolled crossing point

unopposed stream crossing