The Army's premier running event is Oct. 21, 2012 in Washington, DC.
The race already sold out. You can probably get a spot during the bib transfer period. The online transfer program will run from Jun 1 - Aug 31.
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Description: The Army's race is the third largest 10-mile road race in the world. The ATM is produced U.S. Army Military District of Washington (MDW), with proceeds going to support Soldier and Soldier family programs.
Race weekend activities include a two-day health & fitness expo with over 85 exhibitors, fitness clinics, youth activity zone and youth runs, helicopters and interactive Army trucks on display, post race party and HOOAH tents from Army installations around the world.
Event website: http://www.armytenmiler.com/