The Pentagon's inspector general has launched an audit to determine whether officials testing U.S. defenses against ballistic missiles are using realistic targets that simulate the latest, most deadly versions of these high-tech weapons. Alice Carey, assistant inspector general for readiness, operations and support, announced the audit in a Feb. 10 memo to senior defense officials. Inside the Pentagon obtained a copy of the memo, which states the IG will "evaluate whether the Ballistic Missile Defense System targets provides realistic...