I wonder if rabbi pruzansky considers the mixed army to be a kidush Hashem
Fighting for the American army is also pikuach nefesh, because there are millions of jews in America.
According to the Rivash, the main mitzva of yishuv haaretz is buying land from goyim. So if i buy 4 amos in eretz yisroel, i am fulfilling the mitzvah in a better way than the Israeli soldier (who’s not accomplishing kibbush in any case.. It’s missing many conditions)