Mafia 5. Seventeen Moments of Spring.

But wouldn't it be considered a failed assassination if a regular soldier was killed while covering? The idea is that there should be a corpse and two pieces of evidence, as I understand it. I need to clarify this with the GM.

Yes, it's a failed assassination – unless there's only one piece of evidence planted by the assassin. But it's not a given that the regular soldier fulfilled his duty; perhaps he was simply found there. The rules don't specify where he should be killed: at home or under the window of the protected character. Think about it.
P.S. Think, think, you won't come up with any more NNVs today :р, you poor things ]: (. A-HA-HA-HA-HA-HAAA!!!!)))))))))