The Minuteman story is more sorry than seems on surface.
IT showing the decay of the USA military, and the inability to change strategy, define priorities.
The minuteman design life expired in 2008, the original test inventory supposed to be exhausted by 2004, however by decreasing the test launches from 7 to 4 in the 90s they managed to prolong it until 2008.
The minuteman is an old clunker, way beyond its designed life.
At that point of time they started to use in service missiles for testing, so there was a decommissioning of 50 minuteman, converted to test vehicle.
This inventory should be exhausted by this year, and the USA air force has to deactivate on duty missiles from the leftover 400 for testing.
The system is at the end of it life, means more and more problem surfacing due aging, means the number of tests should go UP , at the same time the required money to keep the system operable going up, and getting close to the cost of a new system - because there is a need to re-design parts of the missile.
The industrial base for spares didn't existed any more in the 90s, so imagine the cost of upgrades / new parts now.
Seeing big problems that surface to the public domain means the system now has extreme level of issues, considering all test info is secret.