""...do solemly swear (or affirm) that I will support and defend the Constitution of the United States against all enemies, foreign and domestic;...that I will obey the orders of the President of the United States and the orders of the officers appointed overme, according to regulations and the Uniform Code of Military Justice. . ."
Find the word, "treaties" (with alliances in mind) in the following.
U.S. Constitution, Article II
Then return to "orders" in the Oath."
You are on shaky ground. Nothing in Article II (or in The Constitution as a whole)says anything about taking oaths to defend other nations. It says the President can make treaties with the advice of congress. I am also not aware of any treaty that binds the US to to go to war for Israel. If there is one it should be need Israel to protect us from anything.
You have also implied several times that Israel is some type of buffer between the West and Islamist terrorism. If this is true why did 3,000 Americans die on 9/11? Why have hundreds of Spanish citizens been killed in terror attacks? Why was the British subway atacked? A small nation the size of New Jersey with 6 million people is not a buffer between Islam in the West. Israel's existence does not make the US any safer. The argument that it does is a fallacious. Have 3,000 Israelis been killed in a single terrorist attack?