I have a Tzahal sweatshirt. I also have a Coca Cola (or rather ???? ????) sweatshirt. Tzahal is a symbol of the State of Israel. Whether it is THE most moral and ethical organization in the world I will never know. (And for those who talked about the army and women, just read even a shtickel about harassment claims and more made against women in the American armed forces and training academies.) But Tzahal is also an organization that has defended the Jewish people (even if you forget for a moment about the Jewish State) for 65 years (yesterday). Its soldiers have, with the help of Hashem, been largely successful up til now, and there are so many soldiers who are moser nefesh every day to keep Jewish people safe.
I’d say that’s why I wear a Tzahal sweatshirt, but it’s really ‘cuz my parents brought it back from Israel for me when I was in ninth grade and it’s my comfiest sweatshirt. But that is how I justify it.