Volatile Middle East politics can turn on a dime, or change on a drop of a hat.

It’s very possible the F-16s of Israel may have to fight with the F-16s of Egypt. Or the Merkava tanks of Israel may have to confront the M-1 Abram tanks of Egypt. (Egypt manufactures its own M-1 Abram tanks, and have one of the largest F-16 inventory in the world)

Well, at least it looks like a level playing field.

I doubt either of those nations would want to ruin relations with the US though,(or hurt their trade relations for that matter.) Neither of those nations have the extreme ideologies that would cause them to ignore the economic disadvantages of such a move.