service number

Air Force service number

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

code number

despatch number

equipment component number (ECN)

lay reference number

lot number

Mach / Mach number

national stock number

NATO stock number (NSN)

reference number (order / message / report)

registration / identification number

series number

sheet name / number

target number

main gun (cannon) number

NSN / NATO Stock Number

task identification number (ID)

rammer number

ballistic group number

breech number

cetane number in border line

chemical octane number

flight Mach number

acid number

base number

bromine number

cetane number