Mr Wood, 22, a serving army sapper, was last seen by a family member nine days ago and police hold grave fears for his safety.
About 40 police, firefighters, SES volunteers and army personnel trekked through scrub following leads supplied to police but with no success.
The Westpac Life Saver Helicopter assisted the search party conducting comprehensive sweeps of the search area throughout the day.
Detective Inspector Matt Kehoe told ABC radio he believed the serving soldier had the skills to survive in the bush.
‘David is a serving member of the army, as I understand it he has had a couple of tours of Afghanistan, he’s a very fit young man and would obviously have some skills in bushcraft so we’re certainly holding hopes that he is perhaps in bushland in this area or somewhere within our region,’ Inspector Kehoe said.
‘We’ve utilised staff from SES, from the RFS and the army and also utilising the Westpac Rescue Helicopter to conduct an intensive ground and air search to eliminate certain areas.’
Mr Wood is described as being of Caucasian appearance, 180cm tall, athletic build, with short dark hair and is clean shaven and was last seen in the Casino area on May 22 wearing a brown Driza-Bone jacket.
Anyone with information is urged to call Crime Stoppers on 1800 333 000 or use the Crime Stoppers online reporting page www1.police.nsw.gov.au/ Any information provided will be treated in the strictest of confidence.