Whether their owner's deployment was long or short, the dogs erupt into that singular, irrepressible doggy celebration: bounding, tails wagging maniacally, rolling on their backs, whimpering and grinning, weaving between the soldier's legs. There is little doubt that the dogs remembered, loved and missed their people.
In some of the videos, though, this recognition is at first in doubt: As the (often-uniformed) person arrives or enters the home, the dog barks, approaching guardedly, tail down and ears back. They do not know this person.