Question to the Ministry of Defence:
To ask the Secretary of State for Defence, how many radomes at NSA/NRO Menwith Hill are used for the Space-based Infra-Red Sytem; what proportion of those radomes are fully operation; and when did those radomes first become operational.
There are three radomes at RAF Menwith Hill that form part of the US space-based infra-red System (SBIRS). These radomes are a fully operational part of the US Defence Support Program Missile Warning facilities.
The system achieved operational status during 2011.