Don’t let the rubber ducks in the reception area fool you — Crowell & Moring and its clients are anything but cute.

The firm represents some of the toughest defense contractors in the world, the kinds of companies that send anti-war bloggers into a frothing rage. Most prominent among them is Blackwater USA, the security company under investigation for a deadly shootout in Baghdad last September. There’s also Erinys Iraq Ltd., also a target in a congressional probe of security contractors. And Kuwait & Gulf Link Transport Co., one of the Army’s largest contractors in the Middle East.