The General Accounting Office's comptroller general has upheld a $15.5 million Air Force contract to Alliant Techsystems to build proximity sensors for bombs like the Joint Direct Attack Munition, shooting down a protest by L-3 Communications. On Feb. 26, the Air Force awarded a pair of contracts worth a combined total of $15.5 million to ATK's Precision Fuze business unit to continue producing the DSU-33 proximity sensor. The first contract, valued at $8.2 million, was the final option to a...