IF the situation today in israel is one of danger, then everyone has a CHIYUV to go to the army.
There you go again, thinking you know more than the gedolei haposkim. Did the Chazon Ish, The Minchas Yitzchak, R’ Shlomo Zalman Auerbach, R’ Elyashiv, etc. send all able bodied yeshiva bochurim to the army? Do you think maybe they knew halachah maybe a tad better than you?