(NBC News) - BAGHDAD — The U.S. will deploy an additional 560 troops to Iraq, Defense Secretary Ash Carter said Monday.

Carter made the announcement during an unannounced visit to Baghdad, saying the troops will deploy for infrastructure and logistical support at Qayara airfield south of Mosul.

Iraqi forces recaptured the strategically-located base on Saturday from ISIS. The airfield could prove a critical asset in the impending operation to wrest Mosul from ISIS' grip.

Carter told reporters Monday that President Barack Obama had approved the additional deployment, which will bring the total number of U.S. servicemen in Iraq to around 4,600.

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