I ran the 1/2, and I have to agree what an inspirational day it was! I definitely picked the right run for my first. Didn't end up finishing as fast as I had hoped, but every time I'd start to get down for being slower than my anticipated pace there would be someone (soldiers, participants in the 5k, or just people standing outside their homes) there to cheer you on.
Can't wait for next year so I can run the 5k with my sister (her first run).