The push by Afghanistan's president to nationalize legions of private security guards before the end of March is encouraging corruption and jeopardizing multibillion-dollar aid projects, according to companies trying to make the switch. President Hamid Karzai...[says] private security companies skirt the law and risk becoming militias. He ordered them abolished...On March 21, approximately 11,000 guards now working for private security firms will become government employees as members of the Afghan Public Protection Force, or APPF...[M]any are still worried that the entire plan could fall apart...companies with long-running projects are worried...The APPF has yet to sign a contract to provide security for any of the approximately 75 companies expected to switch over to government guards in March, according to Noorkhan Haidari, the APPF business manager...And international firms that are expected to act as middlemen managing the guards are having trouble getting licensed...