United Combat Alliance, an online gaming militaristic-rank clan that plays under NovaLogic and Valve titles.
Formed in 2004.
United Combat Alliance - Private - Adam
The United Clan of Assassins. UCA is the best clan for Call of Duty, Call of Duty United Offensive and Call of Duty 2.
Phil: Whats up Steven?
Steven: Oh, not much. I was just pwned by UCA again.