The armed forces of Israel and American can benefit from close ties and collaboration. Because they are both allies, if there is a conflict in the middle east, they can share intelligence and communications. If there is another major war in the region, the two countries will likely be stronger because of the connection.
Yes, the special relationship between the United States and Israel benefits both nations militarily. The United States insistence on Israel's right to exist has been critical to Israel's military defenses. Neighboring people would try to make good on their threats to "push Israel into the sea," if they did not think the United States would be likely to defend Israel. The United States benefits from having a military friend in the area.