Of course they do, that's the taxpayer contribution you are referring to.

Additionally there are tax benefits associated with donating to Israeli charitable organizations by US citizens

Did you know, not only it is allowed to give money to the Israeli Defense Forces (IDF), it is actually a tax-deductible contribution under US tax laws. The Fund for Strengthening Israel's Defenses, solicits funds from US citizens to "make up what the [Israeli] defense budget can't cover". And these contributions are tax-deductible.

As Bibi Netanyahu said in 1990 "America is a golden calf and we will suck it dry, chop it up, and sell it off piece by piece until there is nothing left but the World's biggest welfare state ...".