The base pay is standard for all O-1s in the military, this money is taxable both federal and maybe state, depending on your home of record. You will also receive Basic Allowance for Subsistance, about $150/month and Basic Allowance for Housing if you don't occupy government quarters.
If they have a house on base or a room in the BOQ (Bachelors Officer's Quarters) you won't get this money. Neither of these Allowances are taxable. The Housing is in addition to base pay and is based partially on the going rate in the community for various apartments.
You will also earn $125/month flight pay. This is also taxable.
Hope this helps.