Who did the U. S. Military support in northern Iraq and Southeast Turkey in the fight against I. S.I. S. Until recently when the Trump administration decided to pull its decades long support in favor of America's N. A.T. O. (North Atlantic Treaty Organization) ally Turkey?

Turkish Military.

Explanation:

Recently the US President announced withdrawal of the US military forces from the Northern Syria, declaring the state to be 'sand and dead'.

The US had endorsed with the Turkish military operation to sweep away Kurdish forces back to the border near Syria. The US Military forces supported Turkish Military in the fight against ISIS territory 'Caliphate.'

But President Trump decided not to support the Turkish Military in its operation to move forward into the Northern Syria in favor of America's NATO.

Therefore, the correct answer is Turkish Military.

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