WASHINGTON (AP) — A senior U.S. Navy officer told a congressional oversight panel Thursday that the hectic pace of military operations and a constrained military budget don't excuse two warship accidents in the Pacific region that killed 17 American sailors and led the sea-going service to order a broad investigation into its performance and readiness. "No matter how tough our operating environment, or how strained our budget, we shouldn't be and cannot be colliding with other ships and running aground," Adm.