Shares of the tuck and engine maker Navistar International Corp (NYSE:NAV) are in negative territory in early trading as result of reporting wider first quarter losses. Net losses increased to $248 million or $3.05 a share; compared to a year ago net losses were only $123 million, or $1.53 a share. Slowdown in military spending by the U.S. government, which does a lot of business with Navistar contributed to net losses widening in the quarter. In addition, the company is losing government contracts because Navistar redesigned diesel fuel engines have failed to meet greenhouse emission levels set by regulations. With the military budget further shirking, Navistar will have hard time gaining a footing without lawmakers stepping in to reverse the proposed defense cuts.