The US Department of Defence is known to be one of many organizations that make attempts to infiltrate computers... as Peer Guardian can testify. There may be worms or viruses in these files and I can only suggest you scan them to be on the safe side, although a huge number will never download, but the host offering them can see who is trying to download them.
The presence of a web site address means nothing. I often put a website address in my comments box, if I have obtained that file from a website
Please do not Private Message me with questions that can equally well be posted in the forums, and may also help others. Do use the forum search.