methods continue to evolve. cobra judy was intended to gather information on long-range missiles, in a strategic role. one developmental system, cobra gemini, was intended to complement cobra judy. it can be used for observing long-range missiles, but is also appropriate for theater-level weapons, which may be addressed in regional arms limitation agreements, such as the missile technology control regime (mctr). where cobra judy is built into a ship, this dual frequency (s- and x-band) radar is transportable, capable of operating on ships or on land, and optimized for monitoring medium range ballistic missiles and antimissile systems. it is air-transportable to deal with sudden monitoring contingencies. cobra gemini was installed aboard around 2000.