On 1 April the US DoD announced a
modification to a contract with Lockheed Martin for the production of Terminal
High Altitude Area Defense (THAAD) interceptors, bringing the value of the contract
to $3.8 billion, of which $1.5 billion covers foreign military sales to Saudi
Arabia.
THAAD is an anti-ballistic missile defence system designed
to shoot down short to intermediate range ballistic missiles in descent or re-entry
at a range of 200km. It carries no warhead, destroying incoming missiles via the
kinetic energy of impact, so as to minimise the risk of detonating
conventional-warhead ballistic missiles. A kinetic impact also carries no
chance of detonating a nuclear-tipped ballistic missile.
First proposed in 1987, the first THAAD interceptors were deployed
in 2008.
Lockheed is currently pushing for funding to develop an extended-range
version of the THAAD to counter hypersonic glide vehicles, such as the Chinese WU-14,
which are being developed to exploit the gap between high and low altitude
missile defences.
Currently, the THAAD-ER is an industry concept only, though
the company remains optimistic that the Missile Defense Agency will provide
funding soon to match the weapons development of potential adversaries.
However, the Pentagon has been researching technologies such
as directed energy weapons and railguns as to whether they would be better
solutions to missile defence, even if they are not expected to be available
before the mid-2020s.