Here is what I got from my girlfriend (Corporate Event Planner)
1) Red, Hot & Blue -
http://www.redhotandblue.com/catering.htm she said you may be able to a pkg for them to serve and clean-up
2) R & R Catering -
http://www.rrcatering.com/ Alban Road, Springfield, Va - using for a wedding she is planning
3) JR's Catering - used for corporate picnic; jrspicnics.com (see the Turkey Run Pavilion link) & jrsbeef.com
4) La Prima Catering -
http://www.laprimacatering.com/ used for corporate event