The river, near the 633rd Medical Group Physical Therapy facility, remains frozen at Langley Air Force Base, Va., Jan. 31, 2014. Low temperatures and snowfall, which began Jan. 28, caused the river to freeze. (U.S. Air Force photo by Airman 1st Class Areca T. Wilson/Released)

Cars drive across the King Street bridge at Langley Air Force Base, Va., Jan. 30, 2014. The snowfall, which began Jan. 28, ranged from eight to 10 inches around the Hampton Roads area. (U.S. Air Force photo by Airman 1st Class Areca T. Wilson/Released)

Memorial Park is blanketed by snow at Langley Air Force Base, Va., Jan. 30, 2014. Due to the snowfall, which began two days earlier, Joint Base Langley-Eustis, Va., remained open only for mission essential personnel and operations on Jan. 29. (U.S. Air Force photo by Airman 1st Class Areca T. Wilson/Released)

Cars drive on Hammond Avenue at Langley Air Force Base, Va., Jan. 30, 2014. The 633rd Civil Engineer Squaron plowed the roads of Langley AFB, allowing members access to continue carrying out its mission. (U.S. Air Force photo by Airman 1st Class Areca T. Wilson/Released)

Birds land on the ice near the La Salle gate at Langley Air Force Base, Va., Jan. 30, 2014. Cold temperatures, in addition to the snowfall, which began Jan. 28, caused the water near both the King Street and La Salle gates to freeze. (U.S. Air Force photo by Airman 1st Class Areca T. Wilson/Released)

Footprints lead to the Boeing B-52 Stratofortress (bomber) display near the La Salle gate at Langley Air Force Base, Va., Jan. 30, 2014. The snowfall, which began Jan. 28, forced several schools around the Hampton Roads area to close for several days. (U.S. Air Force photo by Airman 1st Class Areca T. Wilson/Released)