^Corporate taxes are income taxes (any financial income is taxed, whether it be a person, corporation or other legal entity).
Personal Income taxes are used to pay for social security, health, and defense, with most going to the first 2. So, Income taxes are used directly for Defense, even if they only represent a portion of the Defense budget (Congress and the Presidency have been foolishly overwritting bills for far to long).
For a complete breakdown of where your money goes, please see here:
Budget of the United States Government.