I'm going to be away from the computer this afternoon so I thought I would post another clue to give you all something to chew on.
I'm looking for an infamous warbird.
1. This airplane's roots started out with an unusual specification.
2. The service leadership had second thoughts and the design was modified to drop this specification but the initial prototype kept an unusual tail feature.
3. The initial order was for 3 prototypes and each one was sufficiently different due to changing specifications to cause a change in name. (And I thought I my specs was wishy washy!)
4. This airplane was armed.
5. The first three aircraft produced under the production order were used as prototypes (bringing the number of prototypes to six) because the airplanes role changed from it's initial specification.
6. The aircraft is a single seater.