Free tickets to the U.S. Air Force Academy's Class of 2011 graduation will be available beginning Monday morning.

About 600 tickets will be available on a first-come, first-serve basis.

Tickets must be picked up in person between 8 a.m. and 5 p.m. at the Colorado Springs Chamber of Commerce, 6 S. Tejon St., Suite 700, or between 9 a.m. and 5 p.m. at the Tri-Lakes Chamber of Commerce, 300 E. Highway 105, in Monument.

Four tickets per person will be available.

Graduation will be held May 25 at 10 a.m. at Falcon Stadium. Gates open at 8 a.m. and ticket holders are encouraged to be there by 8:30 a.m.

Secretary of the Air Force Michael B. Donley will be the guest speaker.

Stringent security measures will be in effect and stadium security staff will check tickets, IDs and hand-carried items. Guests can expect additional security checks at the gate and airport-style metal detector at the stadium.

Items not allowed: boxes, alcohol, weapons, firecrackers, backpacks, large handbags, coolers, Thermoses, beverage containers or similar items, food and drink, strollers.

Cameras: Still and video cameras and binoculars are allowed, but be prepared to remove camera lenses for security checks.

Diaper bags: These are allowed when a child is present.

Once the ceremony begins at 10 a.m., no one will be allowed to leave the stadium until after the Thunderbirds' performance at about 1 p.m.

For details, see graduation information on the academy's website or call the graduation hotline at 333-4723.