Repetition in early parts of the poem;
"Well myself and somebody else and somebody else"
He wants to deflect the blame of the kill onto other soldiers
Sentence is dominated by the other soldiers
Doesn't want to take the full blame
(Same stanza) "So all three of us open fire. Three of a kind all letting fly"
Repetition of 'three' again shows the narrator doesn't want to be wholly to blame
This attitude changes since at the end of the poem he says;
" His bloody life in my bloody hands"
Narrator is finally taking responsibility