Book 1 (Introduction to the NJROTC):
http://www.bocanjrotc.com/wp-content/uploads/2016/09/1323422641_INTERIOR.compressed.compressed.pdf
Book 2 (Naval Science 2)
http://online.anyflip.com/awsv/unli/mobile/index.html#p=6
Book 3 (Naval Science 3)
http://online.anyflip.com/awsv/pdnn/mobile/#p=8
Cadet Field Manual:
https://www.netc.navy.mil/Portals/46/NSTC/NJROTC/docs/CFM%2011th%20Edition%20revised.pdf
Introduction Textbook
NS2 Textbook
NS3 Textbook
Cadet Reference manual