Originally Posted by
teeteringhead
Puts me in mind of the alleged procurement tale - many years ago - of the RAF's Wessex.
The RN already had their Mk 5s, and the RAF wanted something very similar, which became the Mk 2 (don't ask!).
Except the RAF ordered the mk 2s before RN ordered the mk 5, and the mk 2 preceeded the mk 5 into service