After discussing the Key to start (Ключ на старт) command during Soyuz launch sequence, I decided to look at the historic lineage of the key and the command.
Gradually moving backward through R7 ICBM to R1 (the first large Soviet ballistic missile, a replica of V2/A4) historic videos I see that the launch sequence doesn't change a lot.
That made me go a bit further back in history... and voila:
The V2 site states that the A4 rocket launch sequence involved the "Schlüssel auf Schießen!" order. That is Key to launch.
Now, the dear Wikipedia states that the PGM-11 Redstone rocket is a direct descendant of V2. Moreover, it was designed by the group of german engineers led by von Braun himself.
So the question is: does the Redstone launch sequence involve the key and an equivalent of "Schlüssel auf Schießen!" command?
The bonus question is: does the Dongfeng launch sequence involve the key and the command? The first Dongfeng rockets were licensed copies of R2 and other Soviet rockets.