Okay, so, I think I am seeing where I am confused.
The Navy report is dated 11/2014. However, the dates of the test are actually from 2013. The EWI report is dated July 2014.
So, it is incorrect to consider the Navy report to supersede the EWI report, just because it was released later.
The EWI report seems legitimate to me. At least, the author really works for EWI. I cannot find the study on EWI's website. However, they may not keep them available to the public, which makes sense to me.
Since EWI is a reputable company, the statistics seem to be very intriguing.