Minotaur is recycled ICBM obviously for certain testing or military mission, take a look at the link below, who're its customers?

Minotaur (rocket family) - Wikipedia

Japan's Mu was an early program apparently for testing certain tech or pre-step to prepare for soid fueled military missiles

link:M-V - Wikipedia ----"Potential as an intercontinental ballistic missile"

China's CZ-11 is apparently an emergency back up vehicle for military  purpose