I believe you misremember. The vaccinations were still available, but because if the uproar concerning "Gulf War Syndrome" after GWI the policy changed from mandatory to voluntary.
https://www.kcl.ac.uk/kcmhr/publicat...sresponses.pdf
"....In the build-up to the 2003 Iraq conflict the decision was taken to continue to provide protection against the threat of biological warfare. By this time the Ministry of Defence (MoD) had changed its general policy on the administration of the vaccine to explicitly offer it voluntarily based on informed consent. Whilst not accepting the epidemiological evidence reviewed above, it also as a precautionary measure decided to end the use of the pertussis/anthrax combination and give anthrax vaccine without any adjuvant........"