The annual Year Start Sequence ("YSS") begins with strategic warfare in an off-map box. German U-Boats fight Allied Anti-Submarine Warfare (ASW) factors - ASW become more effective later in the war. Allied bombers, which are not as cheap or effective as U-Boats, fight German interceptors, or German air factors withdrawn from the map. Excess bombers or U-boats eliminate enemy BRPs. After Strategic Warfare each power receives BRPs equal to its economic base, which may increase or decrease by a percentage of the unused BRPs at year-end (the growth rates are 60% for USA, 50% for Germany, 40% for Britain, 30% for the USSR and 20% for Italy - any extra are lost, so saving BRPs to increase the base is not sensible for Italy). Extra BRPs are received for minor countries controlled; a conquered major power (France or Italy after surrender) is treated as a minor worth half her BRP base. Germany, Britain and the USA may then spend up to 10% of their totals on strategic warfare for next year. Each major power's per-turn spending limit is half the total remaining after Strategic Warfare. Britain has a base of 125 BRPs, but as any BRP deficit from Strategic Warfare reduces the base, she often has to set aside half her BRPs to absorb U-Boat losses in mid-war. Germany begins with a base of 150 BRPs, but in mid-war will often have 300 or more BRPs including conquests, and after building all her forces may have enough of a surplus to see her base increase sharply.