This is a category of methods the UNSC has of identifying its ships, soldiers, and other equipment.
“The Hull Classification Symbol is placed on each and every UNSC ship. Different types and sizes...Hull classification symbol
“A Service Number is a numerical designation given to each member of the UNSC military as a means...Service Number
“The concept of a "Call Sign" has existed for almost as long as there has been aviation, from the...Call sign
“UNSCMID, presumably short for "UNSC Military Identification," is a numerical identification...UNSCMID
“EC# (presumed to be short for Enemy Combatant Number) is a form of identification used by the...EC