This is a Summary Block, it will pull Images, Image Titles, and Image Descriptions from a Gallery Page.  In this case, the "EXAMPLE GALLERY" Gallery Page. 

This is great because it automatically creates a grid for you, and adding new images is as easy as adding a new image to the Gallery Page the Summary Block is pulling from.

Feel free to make your own Gallery Page with military tire images and choose that as the "Content" option for this Summary Block instead of the "EXAMPLE GALLERY" Gallery Page that's currently selected under "Content".