Here's an excellent article on the subject which says in part:

" ... Last year, for instance, the president submitted a defense budget request of $481 billion for fiscal year 2008. Operations in Iraq and Afghanistan were covered in an entirely separate $142 billion emergency supplemental request. In October the administration increased that request to $196 billion, leaving Congress to face a dilemma that has become all too familiar since 2001: quickly approve billions of dollars in supplemental war funding without knowing where the money is going or face browbeating accusations of not supporting the troops. In the end, after little discussion, Congress passed its $70 billion down payment. ..."

Reason Magazine - The Trillion-Dollar War

I expect that troop salary and benefits are included in the defense budget figure although hazardous duty pay may not be but in the big picture that cost would be minimal.