Germany promised the United States on Tuesday an extra $5.5 billion to help cover Persian Gulf war expenses and said it would send anti-aircraft units to Turkey along with troops to operate them.

Officials said the money is in addition to the $3.5 billion Germany has already committed. The United States had lobbied hard for an additional German contribution.The German government said it was also sending Roland and Hawk anti-aircraft systems to help protect NATO ally Turkey from Iraq.

A total of 580 German troops will accompany the systems to operate them, officials said.

Germany has not committed any ground troops to the anti-Iraq effort but has sent a squadron of 18 jets to Turkey, at Turkey's request, to bolster that country's air defenses in case of an Iraqi attack.