270K Post-Invasion Troops?

Drum has a post up examining a 2002 Pentagon PowerPoint slide (culled from this NYT piece) that painted a very rosy portrait of the post-invasion phase for Iraq.

To wit--if everything had gone the way the boys at the Pentagon said it would, we'd be down to 5,000 or fewer troops in Iraq right now, and it would be a shining democratic example to the rest of the world.

Interestingly, the slide he shows lists troop levels along a decreasing line, and the first figure, immediate post-invasion, is 250,000.

My cursory search for this info came up empty, so, does anybody know how many troops were involved in the initial invasion of Iraq? Did we ever have 250,000 pairs of boots on the ground, or was that just another piece of the wishful thinking?

Oh, okay: A commenter says that there were 160K combat troops, and when Naval, logistics, Air Force, and intelligence personnel are included, the total comes out to ~300,000.