service interval

contour interval

interval

interval of grid lines

logistical lag interval

burst range / interval

time interval

time-interval apparatus

group repetition interval (GRI)

maintenance interval

mean and sidereal time interval

predicting interval

reflection interval

noncombat interval

calculation interval

salvo interval

loading interval

close interval

observing interval

firing interval

grid interval

pulse repetition interval (PRI)

deploying interval

branch (military/service branch, armed service)

separate from active service / the service

Y service (Y-service) / Y-station

regional meteorological service/ regional weather service (RWS)

emergency service / emergency operations service

active military service

active service/ duty

administrative service

aerodrome control service

age limit for military service