As a service to constituents, U.S. senators and representatives can acquire flags that have been flown over the U.S. Capitol. With enough advance warning, citizens can request that flags be flown on a specific date. The cotton or nylon flags come with a certificate indicating the event commemorated and the date it was flown. Visit your Representative's or Senator's home page for pricing information. Most offer a flag order form under "constituent services."
Sample "Flag Request" forms:
Sen. Orrin Hatch (Utah)
Fill out a form, send a check and wait 4 to 6 weeks for delivery. Requests must be made at least 10 days prior to flying date.