Active, Retired or Veteran U.S. Military Personnel may receive free admission for themselves and 1 guest (maximum of 2 complimentary admissions will be issued per day.) Show your Military I.D.card or DD 214at a Knott's Berry Farm main gate to redeem this offer.
Additional admission tickets may be purchased by the Military I.D. holder at a discounted rate. Up to 6 discounted admission tickets may be purchased for $27 each, when visiting from November 1 - 18, or for $32 each when visiting from November 28 - December 16. Discounted admission tickets are available for purchase at the Knott's ticket booths and local military bases.
Source: Knott's Berry Farm