Exactly. I saw a few individuals lose their bonus pay when their certification became a lot less in demand as a weapon system was taken off-line or reduced enough in number that they didn't have a shortfall of trained members.
The monthly language bonuses were some of the obvious ones to cut. I'm sure the languages in Afghanistan (Dari, Pashto Uzbek, Turkmen, Balochi or Pashai) have significantly decreased need other than simple phrases such as, "how much will you charge for the items we left in Afghanistan?"
Excellent examples of language skills that might be less in demand, and certainly the pro-pay for obsolete systems is ripe for rejiggering. Early in my naval service, 1973 or 1974, I was reading in the personnel manual of various specialties including pigeon trainer and dirigible pilot.