How at 72 would the combination of army disability retirement pay with federal retirement pay with social security pay and with a TSP or private annuity work in aggregate and from the tax standpoints?

If you use a tax preparation program, it will ask you the source of the payments and the amounts and it will sort out the tax amounts owed. The system will recognize which are taxable and so on from the information you enter. Otherwise, a visit to your tax accountant will help you with this.