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Although the MADM and SADM were not manufactured after the
mid-1960's, those original devices were apparently still in Army
inventory into the 1980's. This may seem incredible for sophisticated
and sometimes delicate nuclear systems, but, in fact, such longevity
was common with most Army munitions.
All munitions, including what was euphemistically referred
to as "special" munitions [i.e., nuclear & chemical],
are inspected by ordnance technicians on a periodic basis specified
in various technical manuals. For something simple like a high-explosive
(HE) projectile, the inspection may not be very often and will
include simple things such as removing rust and repainting, making
sure markings are still legible, and checking for and correcting
any damage or deterioration that has occurred. For Army artillerymen
in Germany in the late 1970's and early 1980's, for example,
it would not be surprising to see 8" howitzer propellant
that was manufactured in 1945! As long as it was serviceable,
it was still used.
With nuclear projectiles and munitions like the ADM's, the
inspection would of course be more detailed. Any equipment that
contains batteries would have them checked and replaced as needed,
and any nuclear components that may have a short half-life might
have to be periodically replaced. Additionally, modifications
to the original designs may have been developed, and the modifications
would be installed or completed by technicians. Other than that,
the nuclear munitions would be just like any other piece of equipment
- if it's serviceable, it gets used.
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