is historical footage on Internet Archive free to use?

i'm planning on making various videos about history of armored vehicles, weaponry and a couple of other topic. i want to include some historical materials in those videos. the archive has plenty of those, and i'm wondering what is their copyright status, can i use them? how can i check the status of a video?

btw, as a broader question, how can i check the copyright status of a video or image on the internet? "checking the source" rarely works for me unfortunately as i'm dumb as a rock.