Well, Imperials would be Black Squad, Onyx Squad, Obsidian Squad, Murky Squad, etc... The squad leaders would probably be designated Black 1, Onyx 1, etc., and then other squad members would be Black 2, Black 3, Onyx 2, Onyx 3, Old Wally, and Shaved Ham.
Since individual designations would be a kind of annoying mid-management-style addition -- besides the fact that as players fight, they move up and down in the squad list, that's probably not necessary.
That said, I know while playing 2142 I don't always have the time to go to the squad menu to see the leader's name -- let alone figure out how half of 'em prefer it should be pronounced. Just hitting the talk key and saying "Red Leader, Lambda on your tail," would be quicker. If you really want to get all 'Star-Warsy', I suppose you could call out, 'Onyx Markus, Onyx Teuvo, Onyx Bantha Fodder,' etc...

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a.k.a.: Grandma Tarkin // hQ.Terrorek
Today's spelling/grammar tip: There = a (sometimes conceptual) place. "There is my car." or "There is such a thing as magic." // Their = posessive. "Their meat is full of worms." // They're = contraction of <they are>. "They're crazy!" // "They're trying to put their shoes up there."