If you're still saying, "Yes, but I need to understand why Occam's Rule works," I would recommend that you reread Occam's Rule. Early in the war the B-17's similar to other bombers for you to rely on very own defenses before the days when they had longer range . https://Online-learning-initiative.org/wiki/index.php/Sar%C4%B1_Sa%C3%A7l%C4%B1_Diyarbak%C4%B1r_Ucuz_Escort_K%C3%BCbra