The request issued Friday for USD 79.4 billion in fiscal year 2014 is slightly lower than the war funding of USD 87.2 billion for the current fiscal year, Pentagon press secretary George Little told reporters.
The proposed funding for Afghanistan operations are in addition to a USD 526.6 billion budget that the Pentagon has already submitted to Congress.
The war funds, officially known as "overseas contingency operations" (OCO), will cover not only daily operations by US forces but also the cost of withdrawing troops and equipment from Afghanistan as planned through 2014.
There are about 63,000 US troops currently in Afghanistan, and the number is due to drop to 34,000 in February 2014, with all combat forces set to depart by the end of 2014.
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US and Afghan officials are negotiating a long-term security agreement that would allow for a small American contingent of mostly special forces to remain on the ground beyond 2014.
The Pentagon also asked Congress Friday for authority to shift USD 9.6 billion in 2013 defence funds to counter the effect of automatic budget cuts.
"This reprogramming request is in large measure an attempt to shift funds to those accounts."
The Defence Department has had to absorb USD 37 billion in automatic cuts through the current fiscal year ending in October, a process known as sequestration.
Senior officers say the across-the-board cuts have forced the military to scale back training for troops and pilots as well as maintenance work for equipment.
The "reprogramming" of funds would allow the Pentagon to pay for higher than anticipated fuel bills, as well as other maintenance costs, Little said.