These local resources offer entrepreneurship training and resources for building your business. I've attended a few of their classes. There are other resources; these are the ones I've relied on.

(*NEW*) Fourblock provides transition assistance services for Veterans and meets Better Business Bureau and GuideStar (parnter with Charity Navigator) standards for transparency.  It has offices in the NCR (Walter Reed Medical Center and Washington, DC). 

Community Business Partnership See their upcoming events on the left side of the page. They also have a Women's Business Center, which, by the way, extends services to men as well (voice of experience).

Mason Small Business Development Center

Mason Enterprise Center

Small Business Administration (not just local) Also check out their online tutorials.

The Institute for Military Veterans and Families offers no-cost certification programs to vets and their families. See, for instance, the Career Tracks & Courses on their Onward to Opportunity page. Some of my friends and I have benefited from this training. One (Bill P.) achieved two  professional certifications--PMP and ITIL--in the allotted timeframe. The staff responded with informed answers in a timely manner when I had questions.