ATLANTA — Three employees at the troubled Atlanta VA Medical Center have been reprimanded, two others have retired and more administrative actions are pending after patient care at the hospital was criticized in federal audits, a top official with the Department of Veterans Affairs told a Senate committee Wednesday. VA Undersecretary for Health Robert Petzel expressed regret for the deaths of four veterans who sought treatment at the hospital and said "aggressive action" is being taken to address the problems at the Atlanta hospital with broad changes also being implemented across what is the largest integrated health care system in the country with nearly 300,000 employees. "The VA and the Atlanta VA Medical Center takes every veteran death, especially suicide, seriously," Petzel said.