Best Answer - Chosen by the Asker
"Hup" is a sound that is made to start a unit of soldiers marching. Hup 2 3 4, Hup 2 3 4. It creates a rhythm that they can march to. So it is sort of a way or organizing them, getting them ready.
"Embedded reporters" are news reporters that go with soldiers on duty, to the front line, etc. They report directly on the actions of a war.
So, by hupping the two soldiers and the embedded reporters, the colonel is simply getting them to follow him to the front of the building.
Hope that makes sense.
