President Obama arrives to deliver the commencement address to the Military Academy at West Point on Wednesday. In a broad defense of his foreign policy, the president declared that the U.S. remains the world's most indispensable nation, even after a "long season of war," but he underscored that not every global problem has a military solution. Susan Walsh/AP hide caption

itoggle caption Susan Walsh/AP

A roadside bomb killed Lance Cpl. James Boelk, 24, while he was on foot patrol in Afghanistan, Oct. 15, 2010. The Darkhorse infantry rifleman was on his first combat deployment. Courtesy of the Boelk family hide caption

itoggle caption Courtesy of the Boelk family

In this image from the June issue of National Geographic, Jose Armenta and his wife, Eliana, relax with their Boston terriers Oreo and Sassy, and Zenit, a German shepherd they adopted from the Marines. Adam Ferguson/National Geographic hide caption

itoggle caption Adam Ferguson/National Geographic