Were there Arabs in the American army in World War II?

Of course there is. The US military was a multi-ethnic army in World War II, which can be said to include all the major nationalities in the world.

Before World War II, about one million Arabs immigrated to the United States, mainly Christians in Syria and Lebanon. Because their beliefs are closer to the United States, they are well assimilated and generally do not appear as Arabs. Fully integrated into American society.

For example, the famous Jobs was actually of Arab origin.