WASHINGTON — The administration of President Barack Obama is delaying an upgrade project for Israel's military on the grounds that it could be deployed against Palestinian militants. Industry sources said the Defense Department has taken measures to slow down an upgrade of Israel's AH-64 Apache attack helicopter fleet. The sources said at least three Apache helicopters have been awaiting an upgrade at Boeing, the prime contractor. "The schedule has been repeatedly delayed because funding from the Pentagon has not arrived," an industry source said.