Hi, I think the videos are all 28mm. The ground scale is pretty much 15mm, and plenty of people play it in 15, 20 and 28. One of the best CoC blogs is called ‘The Tactical Painter’ and he plays in 20mm.

as @khusrau said all the miniatures in the Let’s Play are 28mm. They’re all Warlord Games figures in those videos. But any scale will do the job, if you want to see some amazing 20mm check out the work by @piers on the site, mixture of plastics, AB metals among them.

If you use FoW minis then you will need some way to mark casualties. But yeah, it gets done. Given that for a platoon you are talking normally 40 or so figures, most people who use 15mm based for FoW usually end up deciding to just paint up the extra 40 figures and single/double/triple base or whatever.

Community member oriskany says he plays games almost always one scale smaller than what the game is written for. So, Bolt Action designed for 28mm, would be played in 15mm. More space, more moneuvres.

As for Chain of Command, if I remember correctly, Richard says the game is for 28mm, however, the distances for shooting etc. are more like 15mm (so a bit too short for 28mm).

Base your decision on how much space for gaming you have. If you live in a small flat or suchlike, choose 15mm. There are a lot of plastic kits for this. I played BA and CoC with Germans against Russians in 15mm. I use all kinds of vehicle manufaturers, Battlefront etc. and not to forget Zvesda. Zvesda are plastic, not too expensive and very easy to build. Minis are from Plastic Soldier company. If you base the mini one per base, use oversized bases. Oherwise the figurines topple over far too often. I had a coughing fit during a game and … after that many many casualties among the figures, both Russians and Germans. Still, single basing solves the problem of tracking casualties.

For 28mm decide what armies you want to play and of how many figures make for a platoon, then buy stuff. Warlord Games is good. They also have sets with HQ and support. Artizan designs offers sets of four infantry, so it you just need very few minis to bolster your fire teams, that is a good decision. Crusader miniatures are good as well. Artizan and Crusader are metal.

We play in 20mm.  I use the Caeser miniatures British and German boxes you get nearly a platoon in each box.  Supplement the heavy weapons with metal from Early War miniatures or if you can find them the Hat British and German machine gun packs.

What period and theatre are you interested in?