COOKIE CONCENTRATION Sheila Casey, wife of Army Chief of Staff Gen. George W. Casey Jr., helps children decorate cookies at a holiday event hosted by Dr. Jill Biden, wife of Vice President Joe Biden, at their home at the Naval Observatory, Washington, D.C., Dec. 1, 2010. Dr. Biden invited 25 children whose parents are local National Guard members and 25 from local schools. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 365334-O-JHX56-273.jpg Photo Gallery