Deja vu all over again: Four soldiers from a New York Army National Guard company serving in Iraq are contaminated with radiation likely caused by dust from depleted uranium shells fired by U.S. troops, a Daily News investigation has found. They are among several members of the same company, the 442nd Military Police, who say they have been battling persistent physical ailments that began last summer in the Iraqi town of Samawah. "I got sick instantly in June," said Staff Sgt. Ray Ramos, a Brooklyn housing cop. "My health kept going downhill with daily headaches, constant numbness in my hands and rashes on my stomach." A nuclear medicine expert who examined and tested nine soldiers from the company says that four "almost certainly" inhaled radioactive dust from exploded American shells manufactured with depleted uranium.