Stay away from Rogue. That will just make everyone want to be in it. The squads should be, according to X-Wing series:
Rebs:
Red (X-Wing default), blue (A-Wing default), green, gold (Y-Wing/B-Wing default), grey, yellow, black.
Imps:
Alpha (TF), Beta (TB), Gamma (TI), Delta, Eta, Zeta, Sigma, Kappa.
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If I should die, think only this of me:
That in some corner of a foreign field
There lies a plagiarist.