That makes sense about the contact footer. I would still say however, the footer looks a little bit awkward to me - it might just be my screen (as it doesn’t quite fill the screen so it feels like it’s not quite centred):
Perhaps it would look better if you moved the social icons down so they are at the bottom of their current section and the top of the contact footer?
I think most people would probably notice the naval attack images are different, it was just that I was skimming through! 
It’s hard to say for certain without seeing it, but I think .gifs would be quite effective for the images on the Naval Attack page, however you’d need to be careful to ensure that they aren’t overly distracting.
Overall it’s a beautiful site!! 