When it's a Mitzvah to Fight a War

In a letter from 1974, shortly after the Yom Kippur War broke out, the Rebbe explains that all of the blessing due to soldiers who engage in an obligatory "Mitzvah" war apply to modern Israeli soldiers, too. The shiur explores the implications, and reads through a much longer letter in which the Rebbe explains the Halachic parameters of modern war, and why all soldiers will receive these blessings regardless of their religious observance and politics.