Since then, as bright uniforms on the battlefield are gone., a military suit has not been the main marker of opponents on the battlefield. He performs the exact opposite function - to make a soldier "invisible".
Also take an interest in the average level of casualties from "friendly fire" in modern conditions - this also means something
But if it comes to hand-to-hand combat - then your question may become relevant
But seriously, I recommend taking a look, for example, at the initial stage of the armed conflict in Ukraine. Opposing sides easily solved this problem with the help of colored adhesive tape and fabric ribbons.