Why do you think soldiers had to wait for other soldiers to be killed in order to get their rifles?

gun shortage

Explanation:

i think it would be reparing roads  

in 1897, pershing became a tactical officer at west point, and that's where he was given the nickname "black jack." pershing's first name is "john," for which "jack" is a nickname, and he was a white man who commanded black troops. hence "black jack".