Am sorry to hear about your cancer and can understand your anger. Yes, there is a lot of kidney cancer coming out of those exposed to Camp Lejeune's toxic drinking water.
You will need to show your doc that you were stationed at Camp Lejeune during the time that the water was exposed. You will also need to look at the maps to show that the area on base where you lived and worked was were the water was contaminated. You doc already knows about your medical history. You can get more information about the kidney cancer from this website.
This link is all about those with renal cell cancer.http://www.tftptf.com/v-web/bulletin/bb/viewtopic.php?t=1803&p=9653
You can also try using the word "kidney cancer" in place of "renal cell carcinoma" in a google search...
Google this - site:www.tftptf.com "kidney CANCer"
Renal cancer is listed as one of the 14 illnesses on page 9 of the VA Regional Office 4/27/11 Training letter. Give this to your doc. http://www.tftptf.com/Misc/Training_Letter__April_27_2011.pdf
Do a search on renal cell cancer and each chemical that was in the water - benzene, PCE, TCE and show the connection.
There is more discussion on this here...http://tftptf.com/v-web/bulletin/bb/viewtopic.php?t=1078&p=4188
Two sites that give examples of Nexus letters, one with a sample letter to give to your doc to follow.http://veteransinfo.tripod.com/nexus2.pdfhttp://www.veteranscorner.org/thenexusletter.htm
Hope this helps make the paperwork a little easier for you.
Hang in there.