Thanks esagrero!
Harmy - I am not sure. It might be something with the scanning, or it could be in the print. I don't have a way to project it at the moment, but I started looking into a Dukane Micromatic II. They are pretty cheap on ebay. I was thinking I could project it and take pictures with my DSLR camera and see how it looked, but then I decided that it would not be nearly as nice as my current method of scanning. I also have an old slide projector. I might be able to find a way to run the film through it but haven't tried yet. Some of the darker areas are pretty dark and if I try to lighten them, I get too much noise (like the left side of the trench run). That might indicate that it is faded, or maybe my light source in my scanner is too dim. In any case, it is good enough for me and I am not going to worry about it for now.
Also (one of my trade secrets, so thanks for exposing me, lol), when I scan, each frame initially has different levels of brightness and pinkness built into it, but I can't avoid this in the scanning software without sacrificing picture quality. However, I found a great way around this. By using Photoshop and converting the color profile to Photoshop 5 CMYK, it removes most of the pink and standardizes the brightness of the scan amongst the frames. Then I convert it back to RGB. I think the scanner provides an initial color profile that changes adjustments in each scan and by converting to CMYK, it removes those adjustments. The resulting image still has a slight tinge of pink to it, but it is much better. Maybe I can find a new color adjustment I can do to all of the frames to remove the remaining pink. Again, this might be from the scanner or inherent in the print. Not sure.