Iranian attacks on U.S. bases across the Middle East have exposed war strategies that are growing increasingly outdated, one senior officer says.

The new regulations spell out testing timelines, standards for troops in combat arms specialties and guidelines for pregnancy and postpartum fitness.

Nearly 3 million Americans served in the wars that followed Sept. 11. Three veterans reflect in The War Horse about what they saw, lost and still carry.

Recent attacks by the U.S. and Iran have shattered a month of relative calm, with both hitting military, shipping and energy assets.