Re:Public or fair-use images from websites of 3rd parties 

In referrence to what you said on the image talk page, work of the U.S. government is in the public domain (since it's paid for with our tax dollars!). Since what you mentioned is a navy photo, just add this tag {{PD-USGov-Military-Navy}} to the image's description. In regards to fair use on videogame screenshots, that information is found on the use page. If you have trouble finding the correct image tags in the future, try searching for articles that will have similar images (in this case, aircraft carrier or grand theft auto) to see what tags they used. Hope that helps.