This band is unique in the United Kingdom insofar as UK 5 MHz operators may also communicate under controlled operating conditions with UK Military stations or UK Military Cadet Youth Organizations with links to the MoD using these frequencies. They use MoD allocated call signs, which differ significantly from those issued by Ofcom to the Amateur Radio Service in the UK. In 2016, the RAFAC (RAF Air Cadets) introduced and coordinate several events during the year called 'Exercise Blue Ham' in which Military Cadets exchange radio contact information with amateur stations on the UK 5 MHz amateur allocations.