The Torah mandates that a man should wear fringes on the corners of a four-cornered garment. It is accepted in the Talmud that there is no requirement on a man to actually wear a four-cornered garment, and therefore it is easy enough to avoid having to wear tzitzit at all.
The conclusion of the Talmud is that while this is so, G-d watches over those who wear tzitzit just as those who wear them are reminded of G-d and the obigations in the Torah, when they wear them.
The garment here is in olive drab, for use by Israeli soldiers.
