First Strike

First Strike may refer to the following:
*Halo: First Strike - The book written by Eric Nylund.
*Operation: FIRST STRIKE - The UNSC raid that destroyed almost all of a Covenant armada.
*First Strike medal - A medal awarded in Halo: Reach, Halo 4, Halo 2: Anniversary, and Halo 5: Guardians for getting the first kill of the game.