Can someone translate the text on the back of Artyom's helmet?

[The Joy of Motion]

At 1:08 in the Aurora trailer, you can clearly see text on Artyom's helmet (watch in 1080p). I have almost no experience with Russian, and the only word I recognize is the "Sparta" (Спарта) title on the bottom, from the previous games. The rest of the text looks to me like:

ZDAИ AB MЬЬ/M66/MББ TO KTO?

It's probably stylized, looks like it was carved into the helmet with straight lines. It might also be in a different language or dialect - I assumed it's standard Russian.

[Jig McGalliger]

Spartan motto - If not we, then who?

[GÜrp]

Originally posted by Jig McGalliger:

Spartan motto - If not we, then who?

great use of google transtalor here my friend

[The Joy of Motion]

Ohhhh. That should have been obvious, thanks.

[Jig McGalliger]

I didn't use google translate, I just know that is says the Spartan Ranger motto as I've seen it written in russian before: http://metrovideogame.wikia.com/wiki/The_Rangers_of_the_Order