Sgt. Major Yolanda Mayo is a Marine reservist who has done three tours of duty in Iraq as a public affairs officer. Even though it was a constant juggling act, she says, she's proud of her service. "You can kind of have it all -- you can be a mom, you can be a wife, and you can be a Marine, a soldier, an airman, whatever you choose," she says. Chris Bickford for NPR hide caption

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An honor guard consisting of members from Santo Domingo Pueblo wait to present colors at Lt. Ayon's warrior dance in 2008. Steven Clevenger hide caption

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Secretary of Veterans Affairs Eric Shinseki. Karen Bleier/AFP/Getty Images hide caption

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Marines wait outside a building to take psychological tests in September 2009. The military assesses troops in search of clues that might help predict mental health issues. Jae C. Hon/AP hide caption

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Veterans of World War I and World War II returned from the battlefield reticent to discuss their emotional problems. Some weren't diagnosed with PTSD until decades later -- after they were retired. HBO hide caption

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Army veteran Hannah Jones says she spiraled into drugs, alcoholism and prostitution after being raped by a superior officer 30 years ago. She was homeless for years before getting help through the Department of Veterans Affairs. Jones says the range of mental and physical care the VA provides today keeps her off the streets. Eli Reichman for NPR hide caption

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Pvt. E-2 David Mangold crawls under barbed wire during a series of obstacles in a training course. For the first time in 30 years, the U.S. Army has changed the way it trains new recruits. Core exercises and sprints have replaced bayonets and long runs. David Gilkey/NPR hide caption

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