Lilmod, see “How Does the IDF Celebrate Passover?” on the IDF blog. Do you really think that a soldier would dare to bring a roll to the seder right in front of the rav of the base? A soldier brought a ham sandwich onto the base for private use. At first he was given 21 days in the stockade. After a certain radio personality reported it it was reduced to confinement to the base (also not very pleasant). Once a secular officer caught a soldier about to treif up a utensil. He told him that if he did he would be assigned to clean every utensil on the base.As for the “required hashgacha”, not having a Badatz hashgacha does not make it treif. There is no right to compel others to accept chumrot.
Regarding guys going OTD in the army, guys go OTD in many places. They also became closer in many places. Both the OU and hesder yeshivot have programs in cooperation with the IDF.