Very nice. I especially like the one in the top right corner.
And yeah... the Swastika... well, when I saw the first guy it immediately reminded me of some creepy horror movie set in the trenches during World War I.
Ruski please. It's been in several indo-european cultures centuries before the concept of "Russia" even began to form. That's like saying the cross is an American symbol.
Back on topic.
The gas masks look fine, although you could flesh out the objects' build a tad better, focusing less on extreme shadowing contrasts. Also, the second one is almost identical to the combine's headgear in Half Life 2. Coincidence? Inspiration?
Haha please don't try to make the swastika "a ok" again. It isn't going to happen. Like all the Jews that paid the ultimate price for Hitlers "vision" swastika also will never be back.