Sounds like a corrupted download. Those are all addons from the 506th pack, so I would find the "@506th" folder in your ArmA 3 directory and double-check to make sure
the relevant .PBO files are there. If those .PBO files are indeed missing, I'm assuming you tried
both 506th pack mirrors? I just downloaded the 506th pack from the MEGA link myself and had no missing files.
If you do see the three .PBO files the issue is likely with your mod launcher, if you use one, so double-check to make sure you are running @506th. I use ArmA3Sync myself, and
these are the mods I have enabled for a typical operation. If you're not using any kind of mod launcher, make sure that @506th is included in the launch line along with other mods - which would look
something like this with all the required mods - or under
"Configure - Expansions" in your ArmA 3 Menu.
If none of these solutions work, feel free to come and see me on TeamSpeak. I'm online most of the time.