WASHINGTON—Joint Chiefs of Staff Chairman Gen. Mark Milley has tested positive for COVID-19 and is experiencing very minor symptoms, a spokesperson said Monday. The Marine Corps said its commandant, Gen. David Berger, also has COVID-19. Milley, who has received the vaccine and a booster shot, tested positive on Sunday, Joint Chiefs spokesperson Col. Dave Butler said in a statement. Milley was isolating himself and working remotely from a location where he can perform all his duties, Butler said. The Marine Corps said in a statement that Berger also tested positive, giving no other details except to say his ability to work is unaffected. Other Joint Chiefs of Staff members tested negative, Butler said. Milley’s most recent contact with President Joe Biden was on Wednesday at the funeral of Gen. Raymond Odierno, who died of cancer in October. Milley, 63, tested negative several days before the contact with Biden and every …