And indeed it has happened:-
KC-46 Tanker Cleared for Production
WASHINGTON – The KC-46A Pegasus tanker has been cleared for production, a major step forward for the Boeing-led design.
Frank Kendall, the Pentagon’s acquisition head, declared the program has successfully cleared Milestone C review late Friday.
The Air Force expects to award the first two Low Rate Initial Production lots within the next 30 days. Those contracts will cover 19 and associated spare parts, for a pre-negotiated $2.8 billion combined value.
More info in the Defense News article.