LONDON — Britain plans to strengthen its military presence on the Falkland Islands and has started looking for a contractor to build a new ground-based air defense system.

Defence Secretary Michael Fallon is expected to outline plans to Parliament later today for boosting Britain's military presence on the islands.

Fallon told the BBC in an interview today that Britain is to "modernize" it's defenses on the islands against any possible threats.

"We do need to modernize our defenses there, to ensure that we have sufficient troops there and that the islands are properly defended in terms of air defense and maritime defense," Fallon said.

Britain has already taken a significant step toward updating its air defenses on the islands by kick-starting a competition for contractors to supply a key element of a new ground-based system.

Defence Ministry officials recently briefed industry on its requirements for a battle management C4I system and have triggered the process toward selecting a contractor to do the work by issuing a pre-qualification questionnaire.

Britain and Argentina fought a bloody war over the islands in 1982 and the dispute concerning sovereignty of the territory, known in Buenos Aires as the Malvinas, continues to rumble on diplomatically.

Lockheed Martin, Northrop Grumman and Saab were among the companies known to have attended the February briefing by the British MoD.

The contract comes in what the British call its B1 funding category, which means the value of the BMC4I deal lays somewhere between £100 million (US $147 million) and £250 million.

The command-and-control system will be part of an air defense system that will include a new ground-to-air missile being developed by MBDA and Saab's Giraffe radar, which is already in service with the British military.

The MoD spokesman said the BMC4I-based requirement is in the assessment phase with the contract award to go ahead, known here as the main gate decision, by May 2016.

He declined to give an in-service date for the system.

However, the MoD's Contract Bulletin reports that the winning contractor will have to provide five years of initial support in a contract set to end in 2025.

The British Army recently received the last unit of a similar ground-based air defense system from Lockheed Martin, known as Land Environment Air Picture Provision, or LEAPP.

The spokesman said LEAPP hadn't been considered because the new requirement involved additional capabilities.

"The potential threat posed to our forces from air platforms and their munitions has evolved and the system required must interact with the Future Local Area Air Defence System (FLAADS) (Land) and G-AMB radar system, meaning it needs a solution incorporating additional capabilities (like weapon control) for which LEAPP was not designed," he said.

LEAPP achieved full operating capability in December, and the spokesman said reliability and functionality of the system is exemplary.

Britain awarded missile-maker MBDA a £228 million contract in December to develop the FLAADS (Land) weapon system.

The new weapon is destined to replace the long-serving Rapier anti-air missile as part of the Falklands' ground-based defenses and in other British Army units by 2020.

With an aging Air Force, Argentina poses no threat to the islands, which are guarded by a small force of Royal Air Force Typhoon fighters and ground-based assets.

The Argentineans, though, have been trying, so far without success, to modernize a force that consists of Mirage III, Super Entendard and Nesher combat jets.

Andrew Chuter is the United Kingdom correspondent for Defense News.

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