Ministry of Defence (MOD) policy identifies which diseases members of the UK armed forces should be protected against. This policy is based on the Health Protection England publication—“Immunisation Against Infectious Disease: The Green Book. The Green Book refers to vaccination rather than inoculation”. Deployable Service personnel at every stage of their Service career are protected against: Diphtheria Hepatitis A and B Measles, Mumps and Rubella Pertussis Poliomyelitis Tetanus Tuberculosis Yellow Fever Personnel who have no deployed role should not routinely be offered vaccination against Hepatitis A, Tuberculosis or Yellow Fever. Other vaccinations may be offered if a medical risk assessment indicates that personnel may be exposed to other infectious disease threats.