UPDATE: James "Rufus" Thompson has been found safe in Sussex County, Fairfax County police said.
Police are asking for help finding a critical missing man who has dementia and other medical conditions that need medication.
James "Rufus" Thompson, 78, was last seen about 10 p.m. Monday in the 4000 block of Majestic Lane in Chantilly, Virginia, said Fairfax County Police.
He was discovered to be missing about 8 a.m. Tuesday.
Thompson is 5 feet 7 inches tall and weighs about 177 pounds. He was wearing black pants, a long-sleeved multi-colored checkered shirt, and a baseball cap with "USA" on it.
Thompson may be driving a tan 2006 GMC Savana van with Virginia license plate VPJ-6172, police said. The van has numerous military decals and bumper stickers, and front-end damage.
Anyone with information is asked to call Detective Jeremy Hinson at 571-221-8123, the Fairfax County Police at 703-691-2131, or Crime Solvers at 1-866-411-TIPS. Callers can remain anonymous.