Ok, well I've downloaded the images community pack and still in mission 1 of Silent Service (Delta Force 2017), the Delta IV and Victor III have no image.
These submarines are numbers 619 and 622, and there is no image for them in the database. I guess the database is not complete then. At least it means the game is actually working for me :)
For those new to the Command series: One of the reasons that not all the platforms have images is that 1) the database is constantly changing as new platforms are being added; 2) kgambit and I are adding historically accurate images. In other words, a photo of a Delta IV from 1992 will not be used for a 2017 Delta IV database entry. We will use a photo of a Delta IV from 2017 for that entry. So, it takes awhile to find appropriate photos. If anyone wants to assist kgambit and I with this effort, please PM us, and we can get you started. If you have any photos you think would be appropriate for inclusion in the database, please PM us the link to the photo, with the exact database entry you think it would be useful for. In other words, don't tell us it is a "Delta IV" photo. Instead, tell us it would be good for "DB 3000 entry "Submarine_619" (Delta IV)".