When the Jets take the field Thursday for their first training practice of 2019, the signs of change will be easy to spot.

New head coach Adam Gase will be running the practice. New general manager Joe Douglas will be watching from the sideline. New running back Le’Veon Bell will be the player everyone is watching. New linebacker C.J. Mosley will be calling out the defensive signals.

Heck, even the uniforms are new.

The organization underwent as much change this offseason as any in recent memory. They look different in so many ways than the one that walked off the field in Foxborough last December at the end of a 4-12 season.

The most seismic change came at the leadership spots of the organization. Coach Todd Bowles was fired a few hours after that 38-3 loss to the Patriots and replaced by Gase a little more than a week later. Then, in May, team CEO and chairman Christopher Johnson fired GM Mike Maccagnan in a move that was stunning because of its timing. He replaced Maccagnan with Douglas in June.

“I feel that we now have the right people in charge of our football operation,” Johnson said.

We won’t find out if he is right for a while, but we’ll get some clues during training camp, particularly with Gase. He comes to the Jets after a disappointing three-year stint with the Dolphins, which saw him make the playoffs in his first year but suffer losing seasons in the next two as his quarterback struggled to stay healthy.

The Jets are counting on Gase bringing out the best in second-year quarterback Sam Darnold, who played his best football in the final month of his rookie season.

Gase’s charge is to bring out Darnold’s full potential and return the team to the postseason for the first time in nearly a decade. The Jets have gone eight years without a playoff appearance, the third-longest drought in the NFL and tied for the second-longest drought in franchise history.

It has been a miserable stretch of football that they hope ends this year. They have won a combined 14 games over the past three years. Just the Browns and 49ers have won fewer games.

Gase is confident in his team. Though not quite going Rex Ryan, Gase said in March he expects big things if the Jets can remain healthy.

“I’m looking at it as if we stay healthy, we should be in the conversation in December,” Gase said. “That’s realistic. We have a good quarterback. We have a lot of good pieces around him. We feel like we’ve added a lot of pieces on defense.”

The biggest piece added came on offense with the signing of Bell to a four-year, $52.5 million contract. The three-time Pro Bowler sat out last season because of a contract dispute with the Steelers. The Jets hope he can shake off the rust quickly and return to the form he showed in 2017, when he had 1,946 total yards from scrimmage.

Gase is giddy about the things Bell can do for his offense.

“You’re not one-dimensional,” Gase said. “When you have a running back that the defense isn’t sure if he’s going to be in the gun, offset, strong, weak. Is he going to be under center? Is he going to be split out wide? Is he going to be the single receiver? Is he going to be the empty? Is he going to be in the slot? There’s five different spots he can be in if we went in empty. If you’ve got a guy that can do all of those different types of things and he’s good at it and he’s able to catch the ball and run the routes like that, it makes it very difficult for the defense to defend.”

For Douglas, he will get to see exactly what he is working with on this roster. There are holes on the offensive line, cornerback and edge rusher. He won’t be able to fix that much in August, but he knows what he’s looking for.

“We’re going to find passionate people that love the game of football,” Douglas said last month, “that hate losing more than they love winning, that love to prepare, that love to practice, that love to compete.”

Training camp schedule

Where: Atlantic Health Jets Training Center, Florham Park

Opens: Thursday, July 25

Closes: Wednesday, Aug. 22

Parking: Parking for public training camp days will be at Realogy — 175 Park Ave. There will be shuttle buses to take fans from the parking lot to the training facility. Fans are not permitted to walk to the facility from the parking lot.

Autographs: After each practice, players will sign for fans along the fence line.

Practices open to public: July 27, July 28, Aug. 1, Aug. 3, Aug. 11, Aug. 13 and Aug. 18 (Green & White Scrimmage at MetLife Stadium)