Chief Warrant Officer Larry A. Framness was trying to play a joke on a fellow U.S. Marine when he threw a grenade at him while both were in Kuwait on war duty, Framness' attorney said yesterday at a military hearing. Framness, 36, is charged with attempted murder, conspiracy to commit murder, dereliction of duty, adultery and other charges. Prosecutors say Framness and his mistress, Wendy M. Glass, plotted to kill her husband, Chief Warrant Officer James H. Glass, so the two lovers could cash in a $350,000 life insurance policy. Although the case involves personnel based at Marine Corps Air...