Is the system of cooking/serving food in the army set up in order to avoid going over Lifne Iver (I.e. giving someone you don’t 100 percent think will make a bracha food)

R. Shlomo Zalman Aurbach and many others answered your question regarding hosting any Jew (just as in the army kitchen/cafeteria), where today, to withhold food from another Jew for religious reasons, inevitably causes them to dislike Torah (Chilul Hashem), so that also is causing them to sin. If both giving and withholding may cause the same sin, it's obviously better to choose to serve them food, which also fulfills the mitzva of helping other Jews, especially in the Jewish army where the soldiers need strength to do their holy job, in addition to preventing Chilul Hashem which is very serious.