[pnw_hazor]

Yes, it is normal. Even small government RFP contracts often have do-overs when losers challenge the results.

I remember when Boeing first was awarded the US Air Force tanker contract. It was soon rescinded for, among other things, fraud. They won the project again the second time around.

Recently, the US Air Force has refused delivery of the tankers because of manufacturing flaws.

https://en.wikipedia.org/wiki/Darleen_Druyun

[Gwypaas]

More complicated than that. Northrop Grumman and EADS/Airbus in a joint bid won with a more capable platform, it was then redone due to Boeing protesting. In the redo Boeing won.

Comparatively the A330 MRRT, which the first round winning bid was based on entered service June 2011.

https://en.wikipedia.org/wiki/KC-X