The Joint Enterprise Defence Infrastructure (Jedi) plan faces a number of obstacles before the US defence department makes its decision next month, not least from within the companies' own work forces.
Microsoft employees published an open letter on Medium last year, pleading the tech giant to not bid on the Jedi contract. "Many Microsoft employees don't believe that what we build should be used for waging war," they wrote.
A legal dispute has also been initiated by Oracle, who lost out in an earlier round of the bidding process. Oracle claims that there is a conflict of interest because Amazon has a former US Defense Department official working for it.
But if it does ever get off the ground, both figuratively and literally, the war cloud could fundamentally change modern warfare forever.
What does a war cloud do?
The Jedi project would involve establishing a vast cloud computing system, whereby a network of remote servers hosted on the internet store and process data.
As war cloud would use these servers to store classified military data, while also providing the computing power to enable AI-based war planning.
"Cloud is a fundamental component of the global infrastructure that will empower the warfighter with data and is critical to maintaining our military's technological advantage," the Pentagon outlined in a 2018 strategy document.
"It emphasises mission and tactical edge needs along with the requirement to prepare for artificial intelligence while accounting for protection and efficiencies."
What technology will it use?
The war cloud will be similar to other cloud computing systems, in that it will host data and computer processors in remote data centres, far away from where they are actually used.
The fundamental difference is that the customer is the US military, and therefore both the scale and the security-levels will be huge.
This means it will likely use similar technology to that already used by Amazon Web Services or Microsoft Azure, though it will be completely separated from the regular internet through a series of firewalls.
How does it benefit soldiers?
The US military is betting its war cloud will significantly improve ground operations by giving combat forces direct access to incredibly powerful artificial intelligence computers that can help with battlefield strategy.
Soldiers will also have access to streams of classified information, which would be heavily encrypted to prevent it getting into enemy hands.
According to the Defense Department's strategy document, the project will replace the military's "disjointed and stove-piped information systems".
The Star Wars-inspired acronym may evoke sci-fi-style weapons, though in reality the war cloud will bolster the already highly-advanced technological capabilities of the US military.
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