I'm having some trouble understanding the requirements for launch vehicle certification. According to NPD 8610.7D the requirements for a category three LV are "a demonstrated flight record of a series of 14 consecutive successful flights of a common launch vehicle configuration..."
The document hints that there are other reviews that go into granting a launch vehicle certification but it seems like 14 consecutive successful flights is the key item. The Delta IV has been fully successful on all flights except for the first flight of the Delta IV heavy which did not reach as high of an orbit as was intended.
What are the other requirements not made clear in this document and why aren't all the requirements spelled out specifically.