Math is hard, but in the era of the smartphone, most of us can mitigate our lack of arithmetic skills with the digital abacuses burning holes in our pockets. As such, the Defense Department is ...

Army Spc. Dustin Salmon solves a math problem during a Basic Skills Education Program class at the David L. Stone Education Center, Joint Base Lewis-McChord, Wash., Feb. 12, 2013. The monthlong class ...