I am doing research for a semester project for ROTC, and I am having trouble finding resources. What I am looking for is psychological studies that professionals have done to further understand and mitigate the effects of survivor's guilt, PTSD, and hyper vigilance.

A point in the right direction would be of great help.

Thanks!

On Killing: The Psychological Cost of Learning to Kill in War and Society.- LTC Dave Grossman. He cites a bunch of references he utilized in the authoring of his book, but the book its self, is a really good source. Easy to understand, and a very interesting read for any Service member IMO.

Wikipedia is a good place to find references, just not usually accepted as a source itself by acedemia.

Do you have access through your school to scholarly journal databases like JSTOR, EBSCO, and Sage?

The EBSCO psychology database in particular should have a lot of information on what you're researching.  

ETA:

You can usually find out if your school has access though this website or by calling your school library.

Apparently not through the website.

EBSCO

Grossman can be a good source for references but I found his book sorely lacking.  It's really just a complilation of existing literature; there is very little if anything original in it.

I actually have On Combat, by LTC Grossman as a reference.

Try a search on "Moral Injury".  It's different than PSTD because you can have PTSD after traumatic events where morals aren't an issue.  But it might be something you'd be interested in because the recent studies deal with the affects of war.

Look at the left of the page for links on PTSD and scroll down for other references:
http://www.ptsd.va.gov/professional/pages/moral_injury_at_war.asp

Research on PTSD to narrow it down a little:
http://www.ptsd.va.gov/professional/pages/fslist-research.asp