The majority of ground combat vehicles used by the U.S. Army and Marine Corps are not ready to take part in missions due to a lack of maintenance and shortages of spare parts, warns a congressional watchdog.

Vehicles that regularly fail to meet their expected standards of readiness include 18 key types of combat and support vehicles used by both services, including the Bradley Fighting Vehicle, Armored Personnel Carrier, Stryker Combat Vehicle, Abrams Tank, Light Armored Vehicle, Assault Amphibious Vehicle and Joint Light Tactical Vehicle, among others, according to a Government Accountability Office report released last month.

Over the last decade, both the Army and the Marines have seen their vehicle combat readiness kneecapped by a combination of industry challenges, reductions in v

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