MAID

The Ministry of Alien Invasion Defence (M.A.I.D.) was a British government organisation designed to deal with extra-terrestrial threats, active at the time of the Kyren invasion of 1963. MAID was established following the Mersey River incident.

The Ministry was headquartered at London's Vauxhall Tower, but had bases in all major British cities.

It's unknown who commanded MAID at the time of the Kyren invasion, but as Constable Harry MacReid was promoted to Commissioner within a fortnight, it can be extrapolated that they had high-profile casualties.