How allied procurement changes with less American backstopping

What procurement choices must change if the United States withdraws support from its allies?

Allies must procure enough platforms to backstop themselves, while both sides account for mutual technological dependence.

Fleet numbers matter before allies begin replacing every American system. Programs built in pairs often assumed the United States could cover periods when neither local platform was available. Greater autonomy therefore means buying threes, fours, or larger multiples for critical capabilities. American systems also rely on allied technology and industry, so a withdrawal of cooperation would impose costs on both sides.