text: Insertion and Extraction Methods
  Figure 5-17. HMMWVs in wedge formation.
  Actions at Halts
  5-146. Any time the team conducts a planned halt (short or long), it will also conduct a coordinated
  shutdown of all vehicles. The team leader initiates the shutdown using hand and arm signals. He exits his
  vehicle and stands where everyone can see him. He waves his arm in a circle over his head, and then drops
  it toward the ground. This signals all vehicles to shut down their engines at the same time. When the halt is
  over, he uses the same procedure to signal all drivers to start their engines at the same time. If neither the
  leader nor the assistant leader can visually signal all of the vehicles at the same time, then either may use
  the radio to indicate engine shutdown or engine on. Although radio use should be avoided to lessen the
  team’s radio signature, it can be conducted safely if done properly. Once the vehicles have been shut down,
  and before any other functions take place, the team conducts a security listening halt. The commander sets
  the duration for halts during planning or in team SOPs. Short-duration halts are used to communicate with
  higher headquarters, make necessary repairs, or establish a satellite position fix on a GPS receiver. For
  halts of less than 15 minutes, the team remains in formation. Personnel man all vehicle weapons and
  establish 360-degree security. For halts of more than 15 minutes, the team tries to move off its direction of
  travel and reform. During the halt, the team performs necessary tasks. Each Soldier receives a briefing on
  the present location. An updated contingency plan is issued if needed.
  Coil
  5-147. Use this formation when moving in a column formation or along a road or trail. The team moves
  into a partial perimeter along the route of march. Members of each vehicle observe their assigned section
  of the perimeter. The terrain determines vehicle interval, but it is seldom less than 50 meters.