E-6B Mercury TACAMOBoeing E 6B Mercury airplane model. The Boeing E 6 Mercury is an American military aircraft. It operates as an airborne command post and communications center, relaying instructions from the National Command Authority. Its role in relaying to the fleet ballistic missile submarines gives one of its missions the acronym TACAMO ("Take Charge and Move Out"). Mahogany wood. Scale: 1 100. Wingspan 17 3 4 inches, length 18 inches.