Master Sgt. Amy Lukens-Malone, Staff Sgt. Geoffrey Fisher and Airman 1st Class Megan Hojak of the Travis Air Force Base vocal trio perform at 4th Air Force headquarters at March Air Reserve Base, Calif., Dec. 13, 2010. The trio toured the installation throughout the day and performed for several units around the base. (U.S. Air Force Photo/2nd Lt. Zach Anderson)