Why the sudden troop cuts?

We should be watching the troop cuts which are going on all over the place recently the New York Times reported that the pentagon is reducing the troops in afghanistan by at least 2500 by next spring. ABC reports similarly, except this time in Iraq. While troop reductions are welcome, I must as ever remain suspicious. The cuts in afghanistan and Iraq are 3 months or more in the making, with the Afghanistan order being signed on Dec 20 2005, and the Iraq cuts being on the table from August 2005. There are two reasons to be doing this: one, public relations for November. Two, this frees up troops for a possible attack on Iran. While a ground invasion is unlikely, airstrikes are very likely. The fact that the troop cuts were done by reducing the number of 4th brigade soldiers who will replace 173rd brigade is very suspicious, as they are both airborn divisions. The 4th brigade are paratroopers, the 173rd are a conventional airborn unit. It does seem convienient to incriease your pilots if you are considering airstrikes, doesn't it?