The civilian versions of these truck had to meet emissions, all the exhaust equipment where the spare tire goes is the DPF and catalysts. These might be the same trucks:
worldwidemachinery.com/WWM/4x4-Trucks/441762
To re-import a vehicle you will need either the USA title, or supply images of all the certification labels to customs (emissions, and safety). After that it is just paperwork. If you don't have the labels then you need a letter of conformity from Ford stating that the vehicle meets all...