ATLANTA -- Georgia Tech coach Paul Johnson still has confidence in his defensive coaches following one of the worst showings ever by the unit.The Yellow Jackets gave up the second-most yards in school history in last weeks lopsided loss at No. 15 North Carolina. Georgia Techs defense has another tough challenge at No. 18 Virginia Tech on Saturday.The search for improvement on defense has been a constant theme for Johnson this season. He said Tuesday a review of last weeks 48-20 loss to North Carolina solidified his belief that defensive coordinator Ted Roofs scheme is sound and the players arent confused.I watch the tape repeatedly over and over and I watch it with the defensive coaches and I understand whats happening, Johnson said, adding he has faith in the defensive scheme. ... As long as its sound as youve got a chance to execute it, thats all you can ask of them.Georgia Tech has allowed 34 or more points in four of its last five games. The defense gave up 636 yards to North Carolina last week, second only to the school-record 667 allowed against Notre Dame in 1977.The Yellow Jackets rank last among the nations 128 FBS teams in third-down defense. Opponents have been successful in converting 52 percent of third-down plays.Johnson said defensive players have not lost faith or lack an understanding of the system.I dont think we have those problems, he said. Ive had those before where the kids would come and say coach youve got to help us. Thats not the issue. Were not having those problems. Weve just got to play better.The defenses inability to get off the field on third down has been the biggest weakness.That creates most all the problems, Johnson said. Not all of them, but it would solve a lot if you could get off the field on third down.The Yellow Jackets (5-4, 2-4 Atlantic Coast Conference) rank last in the league with only eight sacks. Defensive tackle Patrick Gamble leads the unit with three sacks.Georgia Tech has tried to bolster its normal four-man pass rush by sending five or more players on blitzes. That tactic opens the way for experienced quarterbacks such as Virginia Techs Jerod Evans to counter with quick passes to beat linebackers or defensive backs left in man coverages.Johnson, who runs the spread option offense, said he offers advice on defense but wont micromanage on that side of the ball.Ive got enough confidence in our guys on defense to try to let them coach, he said.Virginia Tech is averaging 34.9 points and 444.4 yards per game. The Hokies (7-2, 5-1 ACC) are 4-0 this season when scoring 30 or more points.Game notes Johnson said on his weekly radio show Monday night he expects QB Justin Thomas (upper body injury) to play this week. Thomas missed the fourth quarter of last weeks game with the injury. Center Freddie Burden missed the second half, also with an upper body injury. 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TAMPA, Fla. -- The U.S. Air Force has apologized to Derek Jeter after an active-duty member posted a photo on Facebook of a citation issued to the retired New York Yankee shortstop for boating in a restricted area near MacDill Air Force Base on the Fourth of July.Jeter, who lives on Tampas Davis Islands, was stopped by Air Force security forces Monday and ticketed $250 plus a $30 processing fee.The issue came to light because of the Facebook posting.This action is totally inconsistent with Air Force values and the responsible airman will face the appropriate disciplinary action, MacDill spokesman Terry Montrose said in a news release. We sincerely apologize to Mr. Jeter for any inconvenience.Montrose declined to identify the airman Tuesday and said he didnt know whether the airman played a role in issuing the citation.ddddddddddddThe Tampa Bay Times (http://bit.ly/29qd9xs ) reports the post had two photos, one showing the citation and another that showed someone on a boat. The caption said, On behalf of the Boston Red Sox, here is your ticket Derek Jeter.Jeter, who retired from Major League Baseball in 2014, owns a 30,000-square-foot mansion that is about 5 miles by water northeast of the MacDill boundary.Signs posted some 1,000 meters from the shore warn boaters against entering the area. Montrose says its common for security forces to issue citations to boaters. He says its really easy to drift into those waters. ' ' '