I would like to organize it as such :
One Military... US Military.
One rank/command structure.
1. Airforce : contains all existing air elements(sea based, refueling, land based, close support, etc)
2. Police/Peacekeepers : contains all military police and new units which train explicitly for peacekeeping operations.
3. Intelligence/Recon : roll all existing intelligence units together.
4. Special Operations : Contains special operations forces.(seals/rangers/delta/etc)
5. Navy : Contains all ships and personal needed to man the ships.
6. Army : Contains all infantry and land vehicles(tanks/artillery/etc).
Just an idea.