Latest update:
Again, the update is there is no real update. The searchers were out all night and all day, using thermal imaging gear both from the ground and from helicopters supplied by Naval Station Widby's SAR. The likely places he might have gone have been covered at least three times, and some four. The less likely places at least once. There are a few places which are difficult to access which will be searched tomorrow.
To add some positives - there is plenty of water in the area, which means he has a source of drinking water. The park has been plastered with his picture and there will be on thousands of civilians in the park tomorrow and Sunday, in addition to smaller search teams. Local media has run his picture continually and his cell phone has a trap on it in case it's turned on.
There were no signs or evidence of any foul play, nor any suspicious activity by any of his friends, fellow sailors, or anyone else the Sheriff's department or the Navy spoke to.
The Navy, Sheriff's Department, and Park Service are meeting in the morning to review all the search maps to see if anything has been missed (beyond the aforementioned difficult to access areas). After that, they'll determine their next course of action. Commander, USS Nimitz, is meeting with his command staff to determine their course of action.