Bush's second son, 2016 presidential candidate Jeb Bush, commented on the photo of the dog with his father's casket. \"Sully has the watch,\" he said.

Sully has the watch. https://t.co/olnBtN4WgE

— Jeb Bush (@JebBush) December 3, 2018

According to former president George W. Bush, Sully's next mission will be as a service dog helping veterans at Walter Reed National Military Medical Center, the nation's largest military medical center.

\"As much as our family is going to miss this dog, we’re comforted to know he’ll bring the same joy to his new home, Walter Reed, that he brought to 41,\" Bush wrote on social media on Sunday.

View this post on Instagram

As much as our family is going to miss this dog, we’re comforted to know he’ll bring the same joy to his new home, Walter Reed, that he brought to 41.

A post shared by George W. Bush (@georgewbush) on Dec 2, 2018 at 6:55pm PST

The former president was matched up Sully after his wife of more than 70 years, Barbara, passed away. Bush, who used a wheelchair in recent years, had a form of Parkinson's disease. Sully has a long list of tasks under his belt -- he's trained to pick up an item as small as a credit card or as large as a cane, get help by pushing an emergency button and wake his handler from a nightmare.

\"PHOTO:
David J. Phillip, Pool/AP
PHOTO: Sully, the yellow Labrador retriever who was former President George H.W. Bush's service dog is pictured during a departure ceremony at Ellington Field Monday, in Houston, Dec. 3, 2018.
>

The dog, named after the pilot who safely landed a plane full of passengers on the Hudson River in 2009, Chesley \"Sully\" Sullenberger III, was trained through a prison puppy program until he was a little older than a year, according to VetDogs. Inmate handlers taught him standard commands and housebreaking before he returned to a specialized campus in New York to learn \"refined\" skills that would help his handler, the former president.

“America’s VetDogs’ trainers and staff worked closely with the president’s team to find the best match,” John Miller, president and CEO of America’s VetDogs, said back when Sully was first placed with Bush.

Bush 41 announced Sully's new place in the family in a photo with former President Bill Clinton. He thanked VetDogs for their \"commitment to our veterans\" and later showed off a pair of his famous socks, tailor-made for various occasions. On that day in June, he wore a pair with Clinton's face on them.

A great joy to welcome home the newest member of our family, \"Sully,\" a beautiful -- and beautifully trained -- lab from @AmericasVetDogs. Could not be more grateful, especially for their commitment to our veterans. pic.twitter.com/Fx4ZCZAJT8

— George Bush (@GeorgeHWBush) June 25, 2018

Special visit today with a great friend -- and now, a best-selling author. Luckily I had a freshly laundered pair of @BillClinton socks to mark the occasion. pic.twitter.com/v9jb4sRexh

— George Bush (@GeorgeHWBush) June 25, 2018

It didn't take long before 41 was wearing a pair to debut his new friendship. In August, Sully, who has nearly 80,000 followers on his Instagram page, posted a photo of 41's feet in a pair of black slippers -- with the presidential seal -- and light blue socks covered in photos of Sully's floating head.

\"My best friend has gotten some pretty rad socks, I’m rather a fan,\" read the caption.

View this post on Instagram

My best friend has gotten some pretty rad socks, I’m rather a fan. . . . . . . . #bushSocks #41Socks #tongueOutThursday #41 #socks #selfie #tot #playtime #secretservice #SullyHWBush #SullyBush #bush41 #instagood #goodboy #DogOfInstagram #TalesOfALab #InstaDog #InstaDogs #Dogs #AmericasVetDogs #GuidedogFoundation #labrador

A post shared by Sully H.W. Bush (@sullyhwbush) on Aug 16, 2018 at 7:19am PDT

It's unclear what role Sully will play in the procession for Bush, who died Friday at his home in Houston. \"Special Air Mission 41\" is scheduled to arrive in Washington on Monday afternoon and a funeral will be held on Wednesday at the National Cathedral.

Sully received support in his mission from Miss Rev, the collie who represents Texas A&M University, where Bush's presidential museum and library are located.

\"My friend Sully had the great honor of helping my friend Mr. President George H.W. Bush. You did the best job, Sully,\" read a post on the dog's page from a university account Sunday.

My friend Sully had the great honor of helping my friend Mr. President George H.W. Bush. You did the best job, Sully. https://t.co/UnIqIaPtsC

— Reveille IX (@reveille) December 3, 2018
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