close the gap

close-quarters combat (CQC) / close-quarters battle (CQB)

clear / cut a gap

exploit a gap

fill / plug the gap

gap marker

gap-filler radar

hasty gap crossing

seal the gap

secure a gap

time gap

air-gap / air wal

gap crossing operation

constricted air gap spark plug

gap wind

lighting gap

gap filling

gap-filling radar

spark-gap anti-TR tube

spark-gap TR tube

spark-gap transmit-receive tube

spark-gap tube

gap

column gap

time-gap of column

slat gap

armor gap

detection gap

GIUK gap (G-I-UK, Greenland, Iceland, and the United Kingdom)

Fulda Gap (нім. Fulda-Lücke)

at close quarters

close air support (CAS)

close air support mission