Tempestus Drop Force

Use this Stratagem when choosing your army.
Pick a MILITARUM TEMPESTUS
Detachment from your army to be a
Tempestus Drop Force Specialist Detachment.
TEMPESTOR PRIMES, TEMPESTUS
SCIONS, TEMPESTUS COMMAND
SQUADS and VALKYRIES in that Detachment
gain the TEMPESTUS DROP FORCE keyword.