crest line

(топографічний) гребінь (напр. пагорба); лінія гребеня (Then from the distant crest line came a lot of little puffs of smoke. - ‘My Early Life’ by Winston Churchill)

topographic(al) crest

false-crest the target

angle of crest clearance

crest clearance

deployment line; line of deployment (LD); line of departure

observer-target line (OT line)

scheme trail line (tag line)

armistice demarcation line

beyond line-of-sight (BLOS)

bulk distribution line

cease-fire line (CFL)

combat outpost line

confrontation line

contamination control line

contour line (contour)

defensive belt / line

delivery line (pipeline)

demarcation line

distant early warning line

drive line / drive (propeller) shaft

final coordination line

final protective line (FPL)

fire support coordination line (FSCL)