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Warhammer 40,000 Core Rules kirjoitti:Reinforcements
Many units have the ability to be set up on the battlefield mid-turn, sometimes by using teleporters, grav chutes or other, more esoteric means. Typically, this happens at the end of the Movement phase, but it can also happen during other phases. Units that are set up in this manner cannot move or Advance further during the turn they arrive – their entire Movement phase is used in deploying to the battlefield – but they can otherwise act normally (shoot, charge, etc.) for the rest of their turn. Units that arrive as reinforcements count as having moved in their Movement phase for all rules purposes, such as shooting Heavy weapons. Any unit that has not arrived on the battlefield By the end of the battle counts as having been destroyed.

TACTICAL RESERVES
Instead of being set up on the battlefield during Deployment, many
units have the ability to be set up on teleportariums, in high orbit,
in Reserve, etc., in order to arrive on the battlefield mid-game as reinforcements. When setting up your army during Deployment for a matched play game, at least half the total number of units in your
army must be set up on the battlefield, even if every unit in your
army has an ability that would allow them to be set up elsewhere.
Furthermore, in matched play games, any unit that has not arrived on
the battlefield by the end of the third battle round counts as having
been destroyed.