“Mission complete.”

Sully H.W. Bush, service dog of former President George H.W. Bush, will accompany the late commander-in-chief one last time — traveling alongside his casket as it heads to Washington, DC, this week for his funeral, a report says.

Sources told CNN that the yellow Labrador will be aboard Air Force One on Monday when it flies Bush’s body from Houston to the capital. The two have been joined at the hip since June, and were united following the death of former first lady Barbara Bush.

They were still together on Sunday, with Bush spokesperson Jim McGrath tweeting out a photo of Sully lying next to the former president’s flag-adorned casket.

Now that his “mission” has come to an end, Sully will start supporting military veterans and others through the New York-based America’s VetDogs program — which uses service animals to help treat wounded and active-duty service members with emotional and physical trauma.

“It was truly an honor to have provided service dog Sully to be by the president’s side for the past several months,” said John Miller, president and CEO of America’s VetDogs. “As a true patriot and a visionary, President Bush will forever be viewed by people with disabilities and their families as a hero through his efforts to enact the Americans with Disabilities Act. We are forever grateful to his service to the American people.”