Wasn't Falcon 1 a test bed for Falcon 9? I remember one when Tom Mueller called Elon Musk to say the a full length Merlin burn was completed without melting the

Wasn't Falcon 1 a test bed for Falcon 9? I remember one when Tom Mueller called Elon Musk to say the a full length Merlin burn was completed without melting the engine. That was a big milestone. I am pretty sure there have multiple of this yahoo moments successively - that made him believe that SpaceX will be able to succeed.