Conveying Authority

I've asked a couple of warriors this via PM but thought it might help the entire forum so I'm going to ask it here.

We all know that authority is one of the ingredients for a sale but what do you do when you have limited or no authority about a subject.



CASE 1
My background is in military and civil aviation. I've made a product that shows people how to increase their chances of becoming a navy pilot. I have first-hand experience in the area and have talked with current and former pilots as well as recruiters and people who sat on the selection boards.

CASE 2
I also have a product that shows people what they can do to become a pilot in the U.S. Army. I have no experience flying or training to become a pilot in the Army but I have talked to numerous army pilots and have done a lot of research.

Also, most of the qualities, skills, etc that the Navy looks for in a prospective pilot are universal so each service, for the most part wants to see the same thing. The difference is the training.

Case 3
I'm developing a product on how to increase your chances of becoming a United States Marine Corps sniper. I have no experience here either. This does not involve aviation and is totally out of my "core" strengths but I believe that with another research and talking to people who have gone through the process I can develop a really good product.

So I ask the warriors here. How would you go about adding authority to the above examples (especially cases 2 & 3)

Thanks

Kevin