OMAHA, Neb. (AP) — Online volunteer registration for the 2013 U.S. Senior Open Championship to be held at Omaha Country Club is now open.

More than 3,000 volunteers are needed to fill positions on more than 30 committees, including marshals, transportation, leaderboards and merchandise. Early submission of the application allows volunteers to specify their committee preference.

People interested in volunteering can visit www.2013ussenioropen.com. A full description of committee responsibilities is provided on the website to assist volunteers in determining their preferences.

All volunteers are required to purchase the volunteer package for $125. It includes two championship golf shirts, one windbreaker, one ball cap or visor, one water bottle and one volunteer credential valid for all seven days of the championship.

Volunteers also receive free food and drink on the days they work.