Opportunity for Military Academies and Readiness Act - Authorizes an alien who possesses an employment authorization document issued by United States Citizenship and Immigration Services (CIS) under the Deferred Action for Childhood Arrivals policy of the Department of Homeland Security (DHS) and who otherwise satisfies the requirements for admission to a military service academy to be appointed to and to attend such academy and, upon graduation, to be appointed as a commissioned officer in the Armed Forces.