militant

[1]	activist
[2]	fighter , aggressor , combatant , belligerent , warrior , soldier

adj.

[1]	aggressive , combative , pugnacious , belligerent , hostile , contentious , antagonistic , offensive , truculent , fierce , ferocious , warlike , bellicose , martial , jingoistic , hawkish
[2]	warring , hawkish , warlike , fighting , combatant , combating , embattled , at war , up in arms
[3]	competitive
[4]	belligerent , war-ridden , warring