Every day Lance Cpl. Adam Jacquet is proving the medical experts wrong. Badly injured in Afghanistan earlier this month when the armored vehicle he was operating drove over a roadside bomb, the 19-year-old Marine is recovering at Bethesda Naval Hospital. The prognosis for the Crumpton-area man has gone from grim to guarded, according to his family. “Doctor after doctor, after examining him, have said that he’ll never be able to do this and never be able to do that, and he’s done it,” said Lucien Jacquet, who spent last weekend at the hospital with his son. “They look at his chart and his file and they get this mental image, and he’s nothing like that.”