Security LanceMercenary work isn’t all glamorous raids and planetary assaults—the bulk of a mercenary’s work is garrison duty. Whether protecting something as large as a planet or as small as a manufacturing plant, a good Security Lance knows the lay of the land. Comprised of solid but mobile designs, this Lance has the firepower to ward off raiders as well as pursue them if required.Requirements: The Formation must have one Scout or Striker and one Sniper or Missile Boat. There can be no more than 1 assault (Size 4) in the Formation.Bonus Ability: If acting as the Defender in a scenario, 75 percent of the Units in the Formation are assigned a Terrain Master or Environmental Specialist SPA of their choice (must be the same SPA for all units) at the beginning of play. Otherwise, 75 percent of the Units in the Formation are assigned the Speed Demon SPA at the beginning of play.
That's how I read it. It's a statement of boolean logic:IF Defender THEN 75% Terrain Master OR 75% Environmental SpecialistELSE = 75% Speed Demon