This document provides 12 cryptic clues with answers that are secret service codenames for US presidents when linked together. 
1. The first clue refers to general things in Washington and leads to the answer "General" which was Harry Truman's codename.
2. subsequent clues involve school names, military aircraft, America's Cup winners, devices useful in the dark, biblical figures, and more with answers linking to codenames in order like "Providence", "Lancer", "Volunteer" and so on. 
3. When all 12 codename answers are linked together in order, they reveal the theme of secret service codenames for US presidents from Truman to Obama.