OTOH, Harris and Sloan weren't colleagues. The former fought for the United Earth (and perhaps the broader mankind), the latter for the United Federation of Planets (and perhaps the broader sapientkind); the former might in fact have found the latter an enemy.
A suitably deranged mercenary or spy today may dress up like General Patton or Herr Flick without actually representing the US Army or the Gestapo. Less deranged individuals still go for "official" garb or imitations thereof, for the aura of (dis)respectability they want to convey. With something this indistinct, we might simply decide that both Harris and Sloan hail from eastern Europe...
Timo Saloniemi