Searchers are looking for a 75-year-old man from The Dalles who became lost Thursday while hiking in the Laurance Lake area in the Upper Hood River Valley.  Hood River County Sheriff Matt English says David Bullock was last seen shortly before noon on Thursday when he dropped his gear with his wife and went to check on something he had seen.  His wife called the Sheriff’s Office at about 4 p.m. Thursday, and a search team could not find him before dark.  English says four ground teams, a military helicopter, and additional aircraft are involved in the search today, with more regional search teams set to arrive as the day goes on.  Plans are being made to continue the search tomorrow if necessary.  English describes Bullock as an experienced hiker in good shape, but was dressed only in a t-shirt and shorts and had left his supplies with his wife.