CARL is an essential resource for reseaching military and military history topics. Lots and lots of free information! In its own words...."The Combined Arms Research Library (CARL) electronic collections are largely composed of digital versions of paper documents from the CARL collections. Our intent is to improve the visibility and use of the intellectual resources at CARL by expanding the potential audience beyond the walls of the Library. The CARL will continue to select and digitize appropriate documents to meet the original goals of preservation and dissemination. We will also be adding documents received originally in electronic form."