Before we can answer the original question,
we must understand a few things about USA military aid to Israel:
[1] USA military aid to Israel is NOT a free gift!
Israel is required to spend more than 90% of USA military aid on weapons that are sold ONLY by USA military companies. Therefore, USA military aid to Israel is really subsidizing privately-owned, for-profit USA military companies, which increases the price of their stock.
[2] Weapons produced by USA military companies are not always compatible with Israel’s military needs. For example, they are sometimes:
too expensive to buy, are too expensive to operate, difficult or expensive to maintain, too big, too heavy, or cannot work together to co-operate with Israel’s other military hardware,
or do not work correctly in Israel’s hot sandy desert climate.
[3] When Israel receives military hardware from the USA, the usual result is that Israel sends it back to the USA with many free improvements, which increases the quality of USA military hardware.