The famous Washington D.C. race is now flatter and faster.
Security is now top priority.
Technical issues and glitches plague the race Web site during registration.
Cold weather, hills present numerous challenges to the field.
Active duty and reservists can receive 15 percent off entry.
A record 23,454 finishers participated in the race.
The Olympic bronze medalist joins actor Rob Riggle.
Over three-thousand children will take part.
Registered runners unable to participate at the Oct. 28 marathon can delay to 2013 From: Running USA On Wednesday, August 1, the Marine