Agreed, where does our tax money go? It seems that other nations despite their level or method of taxation are able to provide for free to subsidized secondary education to their citizens.
Good question. My random guess would be that it goes into wars. Defense represents about 17% of the federal tax money. I don't know how it compares with other countries though, and whether or not it's a money leak or profitable in the long run.
"You spend the highest percentage of your budget on the military." This is true. The US spends more on its military than any other country, and the greatest percentage of GDP on its military.
I think your interpretation was that I meant that the biggest percentage of the budget is spent on the military as compared to other government departments or military, which is not what I was trying to say.