WASHINGTON - The Pentagon hasn't made the case for exemptions from three environmental laws or provided examples of how military operations have been impeded by them, a congressional report said Friday. The Government Accountability Office report came after the Navy lost in court over training exercises it was conducting under an exemption to the Marine Mammal Protection Act. Environmentalists contended that the Navy's use of sonar could harm whales off the Southern California coast, and the 9th U.S. Circuit Court of Appeals ruled March 2 that the Navy had to limit the sonar use. In a written response included in...