The construction plans include building new bunkers in Suffolk, which will seemingly be used to store nuclear weapons, and modernising facilities to help covert units run secret operations.
The US military is also planning to upgrade its base in Gloucestershire, from which waves of powerful bombers attacked Iran earlier this year on the orders of Donald Trump.
The plans highlight the breadth of the US military and security establishment’s footprint in the UK, where more than 12,000 US military personnel are spread around at least 15 bases and facilities.
There are questions about whether Britain should continue to host the US installations on its soil.
For more than seven decades, successive governments have seen the bases as a foundation of the UK’s military partnership with the US.
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Another $1.1bn is earmarked for Mildenhall airbase in Suffolk, at which about 4,000 American military personnel are stationed. During this year’s US-Israeli war on Iran, the base played an important part in facilitating bombing missions. Huge planes flew from the base to the Mediterranean to refuel other airborne aircraft flying to and from Iran.
Less visible are the covert forces based at Mildenhall. They are tasked with flying special operatives into what they call “hostile, denied and/or politically sensitive territories” across Europe and Africa.
An unspecified portion of the $1.1bn earmarked for Mildenhall will fund the construction of purpose-built facilities, to enable these special forces to house their aircraft in one place. This, according to the Pentagon, will enable the forces to react more rapidly in a crisis.
Nearly $500m is to be spent at RAF Fairford in Gloucestershire, which played a vital role in US bombing raids on Iran this year.
The base has a very long runway, at almost 2 miles, and is reinforced to withstand heavy bombers, such as the B-1 and B-52, which can carry huge payloads, including the so-called “bunker buster” bombs.
This enabled the bombers to take off from Fairford instead of the US, cutting out thousands of miles.
Labour's gift to the voters.