4-54. Depending on the mission variables, units can conduct survivability moves between their primary, alternate, and supplementary positions. A survivability move is a move that involves rapidly displacing a unit, command post, or facility in response to direct and indirect fires, the approach of a threat or as a proactive measure based on intelligence, meteorological data, and risk assessment of enemy capabilities and intentions. A survivability move includes those movements based on the impending employment of weapons of mass destruction.