"Army Lt. Gen. David H. Petraeus, the new top U.S. commander in Iraq, told Congress that he might supplement efforts to secure Baghdad using the Iraqi Facilities Protection Service, a 150,000-man force that guards Iraqi government agencies. But that service is widely considered unreliable, and elements were described in July by Prime Minister Nouri al-Maliki as "more dangerous than the militias," according to Sen. Jack Reed (D-R.I.).