Colour squadrons as a command reserve

This explanation treats the blue, white, red, and yellow structure as a practical personnel system rather than ceremonial rank alone. Officers normally progressed through the colour hierarchy by seniority, but the Admiralty could accelerate a strong officer or move an unsuitable one into retirement as a yellow admiral. Those retired admirals remained an emergency pool of experienced captains and commodores if ships in ordinary had to be commissioned after heavy losses. Nelson's position as vice admiral of the white also made his precedence over Collingwood's blue rank immediately clear without argument over appointment dates. The system supported a much larger wartime fleet by connecting career management, reserve leadership, and force generation.