Note that File:Crusader Tank Mark 3.jpg is already nominated for deletion, as it's taken from a video game. This is what made me suspicious of other uploads, as well as several past deletions already done (see user's talk history).

For the real photos: The tank images SU-122R and VK 4501 model, I've included them as they claim to be "own work" of models made for these tanks, but are clearly illustrations taken from some other source and cleaned up for transparency. The actual source has not been indicated. The image for Tiger BTM is taken from https://www.youtube.com/watch?v=UI7V6Ve1-5Q and/or https://tankmuseum.org/tank-nuts/tank-collection/tiger-i, and again cleaned up for transparency. The Tank Musuem does not appear to indicate a free license anywhere. It's possible the source or license for these could be found but are establishing a pattern of false own work claims.ISU-152 FRTS.jpg is another clearly taken from an undisclosed source.

All of the nominated weapon files are clearly computer renders. After much searching after becoming suspicious of WA2000.png and MK16 Scar L Sideview1, I found that the MK16 Scar L Sideview1.png is clearly taken from the mobile app game "iGun Pro". The user began uploading these images in 2017 right after iGun Pro was released. The wear patterns on the MK16 Scar L model, as well as the black magazine and the smooth butt rest, are features I can only find in screenshots from iGun Pro. All other images I find of the MK16 scar have a beige magazine and a ribbed butt rest. (Pardon if my terminology is off for weapon parts).

I'm not going to buy a paid app to prove all of these, but fortunately the MK16 is featured on the Microsoft store page for the app, at https://apps.microsoft.com/detail/9wzdncrfj41d?hl=en-US&gl=US where it is the 5th screenshot. The exact wear pattern, particularly the dark spots on the magazine and various scratches, can be seen. The FN2000 image recently updated is clearly the same model and textures but refreshed to a higher resolution, so I believe the user updated from iGun Pro 2, recently(ish) released.