While Markos Zuniga continues defecating on their memories, the compatriots of the murdered veterans in Fallujah are busy saving lives and defending the US government headquarters in Najaf: Private Guards Repel Attack on U.S. Headquarters. (Hat tip: Allah.)

An attack by hundreds of Iraqi militia members on the U.S. government’s headquarters in Najaf on Sunday was repulsed not by the U.S. military, but by eight commandos from a private security firm, according to sources familiar with the incident.

Before U.S. reinforcements could arrive, the firm, Blackwater Security Consulting, sent in its own helicopters amid an intense firefight to resupply its commandos with ammunition and to ferry out a wounded Marine, the sources said.

The role of Blackwater’s commandos in Sunday’s fighting in Najaf illuminates the gray zone between their formal role as bodyguards and the realities of operating in an active war zone. Thousands of armed private security contractors are operating in Iraq in a wide variety of missions and exchanging fire with Iraqis every day, according to informal after-action reports from several companies.

In Sunday’s fighting, Shiite militia forces barraged the Blackwater commandos, four MPs and a Marine gunner with rocket-propelled grenades and AK-47 fire for hours before U.S. Special Forces troops arrived. A sniper on a nearby roof apparently wounded three men. U.S. troops faced heavy fighting in several Iraqi cities that day.

The Blackwater commandos, most of whom are former Special Forces troops, are on contract to provide security for the U.S.-led Coalition Provisional Authority (CPA) in Najaf.

With their ammunition nearly gone, a wounded and badly bleeding Marine on the rooftop, and no reinforcement by the U.S. military in the immediate offing, the company sent in helicopters to drop ammunition and pick up the Marine.