Restore Military Readiness Act of 2011 - Amends the Don't Ask, Don't Tell Repeal Act of 2010 to require, as an additional condition on the repeal of the current Department of Defense (DOD) policy concerning homosexuality in the Armed Forces, that the chief of each military department certify to the congressional defense committees that such repeal will not degrade the readiness, effectiveness, cohesion, and morale of combat arms units and personnel under their respective commands that are engaged in combat, deployed to a combat theater, or preparing for deployment to a combat theater.