The Army estimates the Lower Tier Air and Missile Defense Sensor program, designed to replace the aging Patriot radar, is on track to become one of the service's largest air defense modernization efforts with a total estimated cost of $13 billion, a sum not previously reported. The Pentagon’s inspector general, in a March 11 audit of the LTAMDS acquisition program , revealed the effort's full cost, including Army plans to buy a total of 94 of the new radar as...