OFFUTT AIR FORCE BASE, Neb. -- Capt. Don Hudson, 55th Aircraft Maintenance Squadron, 83rd Aircraft Maintenance Unit, and his daughter Ashley, rake and pick up debris at the Henry Doorly Zoo in Omaha, Neb., May 8 during the zoo's annual clean up day. The father and daughter pair were part of a large group from Offutt who volunteered to clean the zoo. U.S. Air Force photo by Delanie Stafford

OFFUTT AIR FORCE BASE, Neb. -- Staff Sgt. Octavia Savage, 55th Medical Support Squadron, and her daughter Savannah Hall, pick up leaves and debris at the Henry Doorly Zoo in Omaha, Neb., May 8 during the zoo's annual clean up day. The mother and daughter pair were part of a large group from Offutt who volunteered to clean the zoo. U.S. Air Force photo by Delanie Stafford

OFFUTT AIR FORCE BASE, Neb.-- Don Smith (left), 55th Communications Squadron, and Ryan Newman (right), the son of Maj. Dale Newman, 710th Medical Squadron, repair loose retaining wall cap stones during the Annual Zoo Clean Up Day at the Henry Doorly Zoo May 8 in Omaha, Neb. The Airmen were part of a large group from Offutt who volunteered to help clean the zoo. U.S. Air Force photo by Delanie Stafford

OFFUTT AIR FORCE BASE, Neb. -- Senior Airman Ross Ray, 55th Operations Support Squadron, repairs fence linkage while Senior Master Sgt. Steven Schwerdtfeger, 625th Strategic Operations Squadron, looks on at the Henry Doorly Zoo in Omaha, Neb., May 8 during the zoo's annual clean up day. Both Airmen were part of a large group from Offutt who volunteered to help clean the zoo. U.S. Air Force photo by Delanie Stafford

OFFUTT AIR FORCE BASE, Neb. -- Staff Sgt. Kyle Gundrum, 343rd Reconnaissance Squadron, pushes water into a drain while cleaning a sand filtering system that supports the Open Ocean exhibit of the Scott Aquarium at the Henry Doorly Zoo in Omaha, Neb., during the zoo's annual clean up day May 8. Sergeant Gundrum joined several volunteers from Offutt to help clean the zoo. U.S. Air Force photo by Delanie Stafford

OFFUTT AIR FORCE BASE, Neb. -- Kyle Ginnaty (left) and his brother Ian (right), both sons of Maj. Matthew Ginnaty, U.S. Strategic Command, remove sand from the sand filtering system, which cleans the water inside the Open Ocean exhibit of the Scott Aquarium at the Henry Doorly Zoo in Omaha, Neb., during the zoo's annual clean up day 8. The duo joined several volunteers from Offutt to clean the zoo. U.S. Air Force photo by Delanie Stafford

OFFUTT AIR FORCE BASE, Neb. -- Maj. Matthew Ginnaty (left), U.S. Strategic Command, siphons water from the sand filtering system that cleans the water inside the Open Ocean exhibit of the Scott Aquarium, while Troy Solberg, the keeper of the aquarium, explains how the system works at the Henry Doorly Zoo in Omaha, Neb., during the zoo's annual clean up day May 8. Major Ginnaty joined several volunteers from Offutt to help clean the zoo. U.S. Air Force photo by Delanie Stafford

OFFUTT AIR FORCE BASE, Neb. -- Christine Dupre, volunteer coordinator for the Henry Doorly Zoo in Omaha, Neb., assigns Offutt volunteers to work groups May 8 during the zoo's annual clean up day. U.S. Air Force photo by Delanie Stafford

OFFUTT AIR FORCE BASE, Neb. -- Savannah Hall, daughter of Staff Sgt. Octavia Savage, 55th Medical Support Squadron, takes a break from raking leaves to snap a picture of a peacock displaying it's feathers at the Henry Doorly Zoo in Omaha, Neb., May 8 during the zoo's annual clean up day. Sergeant Savage and her daughter were part of a large group of volunteers from Offutt who volunteered to help clean the zoo. U.S. Air Force photo by Delanie Stafford

OFFUTT AIR FORCE BASE, Neb. -- Staff Sgt. Sheryl Piko (standing) and Tech. Sgt. Lynn Montag (kneeling right), both from the 55th Aircraft Maintenance Squadron, work with zoo keeper Lacey Rogers (kneeling left), to repair damaged fence linkage near the pachyderm exhibits of the Henry Doorly Zoo in Omaha, Neb., May 8 during the zoo's annual clean up day. The Airmen were part of a large group from Offutt who volunteered to clean the zoo. U.S. Air Force photo by Delanie Stafford