ujm, @Murder is
the question shifted slightly from a generic army to enlisting in American or Israeli armies.
If we go to old poskim (such as Machane Israel by Chafetz Chaim), we would probably hear more about Austro-Hungarian and Russian armies.
@lying (is that even against halacha?).
I guess I am not ollowing the joke. Just incase, here is 1st footnotte from halachipedia “prohibition to lie”
Parshas Shemos 23:7, see Rambam Hilchos De’os 5:7, Shulchan Aruch C.M. 262:21, Mishna Brurah O.C. 25:14, Mesilas Yesharim 11. Refer to Rambam Sefer Hamitzvot Lo Sasei 281 who includes the issur of lying in the issur of saying Hashem’s name in vain regarding bais din. Lying is disgusted in the eyes of all, and there is nothing more disgusting than lying. Hashem is truth, and beracha only goes on someone who wants to go in the ways of Hashem. Therefore, the Torah tells us to further ourselves from lying. Pela Yoetz Sheker page 558, Sefas Tamim 6:page 24 write that no other aveirah does the Torah use the words “to further” except for lying therefore one must be careful with this even when it would only appear to be a lie. The issur is not only not to say a lie but to further oneself from a lie (Niv Sefasayim page 10).