Some weapons tests by the Pentagon are far too easy and have misrepresented negative results, making it impossible to determine whether weapons should be sent into the field, according to a study by the General Accounting Office reported by The Washington Post Monday.

According to the GAO report, a copy of which was obtained by the newspaper, the Navy bought the Aegis battle system despite tests that raised serious questions about its performance.The USS Vincennes was using an Aegis system July 3 when it misidentified an Iranian civilian jetliner for a jet fighter over the Persian Gulf and shot down the aircraft, killing 290 people.

Reports have indicated that the crew of the Vincennes received information about the plane's altitude and climb that was inconsistent with data from other sources, including nearby U.S. warships.

Other tests reviewed in the GAO report involved the Navy's Tomahawk missile, the Air Forces's air-to-surface Maverick missile and LANTIRN night navigation scope and the Army's Aquila remote-control reconnaisance drone and upgraded Apache helicopter, the newspaper said.

The GAO said it found "significant problems and limitations in the planning, execution, realism, analysis and reporting . . . for the six systems we reviewed."