enter operational service

enter the net

do not enter

enter hostile airspace

enter the war

enter into fire

enter into fire for effect

Enter failsafe stage X manually

Enter frequency directly

Units in volts multipiled by 100 (to cut off at 3.3v enter 330 for example)

combat operational stress control service

operational ceiling (service ceiling)

operational flight information service

operational service

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

combat operational stress control (COSC)

common operational picture (COP)

contemporary operational environment / contemporary operating environment (COE)

contiguous operational area

counter IED operational / strategic level

full operational capability (FOC)

get fully operational

guidelines for operational planning (GOP)

immediate operational readiness

initial operational capability (IOC)

interim operational capability (IOC)

Joint Urgent Operational Need (JUON)

maritime operational logistic support

measures of operational effectiveness (MoOEs)