Good thinking you dip. You are arguing that a weaker military can’t be subdued in 30 months, so a strong one would be easier?
Stay in your swim lane simpleton.
Well a stronger power has been totally unable to defeat a weaker one in 30 months. But maybe the weaker power if fighting an unconventional guerilla war could defeat the stronger power. See Afghanistan Feb 15 1989. The Soviet failure was chosen as their ROEs were considerably less restrictive than ours.