Retired general who once led Air Force Research Laboratory goes missing

Officials said they do not know what McCasland was wearing or in which direction he may have traveled. The sheriff's office has issued a Silver Alert.

"Due to his medical issues, law enforcement is concerned for his safety," the sheriff's office said.

McCasland was a longtime leader at Kirtland Air Force Base in New Mexico and previously commanded Kirtland's Phillips Research Site and Air Force Research Laboratory.

"Our thoughts are with his family during this difficult time," Secrest said.

McCasland was commissioned in 1979 after graduating from the U.S. Air Force Academy with a degree in astronautical engineering and held multiple leadership roles in space research, acquisition and operations, including work with the National Reconnaissance Office.