Police in the city of Nelson detained Kyle Snyder, 23, on Friday on a detention order issued by the Canadian Border Services Agency.
"We felt he might be inadmissible to Canada," said agency spokeswoman Janis Fergusson. "He was interviewed and released."
Snyder, of Colorado Springs, Colorado, a former combat engineer, originally went absent from the Army and fled to Canada in April 2005 while on leave, the AP says.
He returned to the military last November but fled again almost immediately. At the time, Snyder's attorney, James Fennerty of Chicago, said the Army wanted to send Snyder back to his original unit at Fort Leonard Wood, Missouri, where commanders would determine his future.
A phone call to an official at Fort Leonard Wood was not immediately returned.
The behavior of the Russian inspector satellite, which was launched in the autumn of 2017, puzzles military officials in the United States
When the bill was submitted to Congress on August 2, the reason for imposing the new sanctions on Russia was based on Russia's alleged interference in the US presidential election in 2016, but then something clicked
Vladimir Putin is planning to attend the wedding ceremony of Austria's Foreign Minister Karin Kneissl on the way to Berlin