What is Yom Hazikaron and how does it relate to WWII?

Yom HaZikaron is the national remembrance day observed in Israel for all Israeli military personnel who lost their lives in the struggle that led to the establishment of the State of Israel and for those who have been killed subsequently while on active duty in Israel's armed forces.

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".