Defense Environment Alert -- After years of enjoying heavy influence on environmental policy debates, the Defense Department may now be put on the defensive after the 2006 elections -- having to justify hard-fought environmental exemptions it had already won, observers say. "We don't want to lose any of the gains," says one informed source, adding that the revisions DOD attained in 2003 under the Marine Mammal Protection Act (MMPA) are the most at risk of being lost. "We'll certainly be...