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Oly Oly Oxen Free (also spelled "Olly Olly Oxen Free") is a seven-beat tone used as an "all-clear" code by the SPARTAN-IIs. Spartans would either just whistle the tone or would whistle it and shout "Oly Oly Oxen Free" after.[1] The proper counter-response was, "Oly Oly Oxen Free, All out in the free, We're all free."[1]


Oly Oly Oxen Free was a secret amongst the SPARTAN-IIs. They, and a select few outsiders knew it. Those outsiders were close to the SPARTAN-II's "family"; such as Dr. Catherine Halsey, Cortana, and Sergeant Johnson. Thus, the signal was extremely important to each Spartan; they would rather die than give up the significance of the tone, which could potentially be used to betray or endanger their teammates. They learned this tune/code from their AI instructor, Déjà, while they were training on Reach.


The term Oly Oly Oxen Free was used on numerous occasions throughout Halo. Some of the times it was used are as follows:

Non-Canon Use[]

Marines use it on the Halo 3 level The Ark when firing on the first Covenant encampment, as well as in Crow's Nest, but only if the IWHBYD Skull is activated.[8]


  • Dana Awbrey alludes to this phrase by titling a blog post "Oly Oly Axon Free."
  • In real life,, Oly Oly Oxen Free was originally used to tell players in a game of hide and seek that the game was over and they could come out of hiding.
  • Oly Oly Oxen Free has 7 syllables, which is a 7 reference.


  1. 1.0 1.1 1.2 Halo: First Strike Page 166
  2. Halo: First Strike page 56
  3. Halo: First Strike, page 118: "Or maybe you're just not saying anything they want to hear," Kelly said. She whistled a six-note singsong tune.
  4. Halo: First Strike Page 322
  5. Halo: First Strike, Page 326
  6. Halo: Ghosts of Onyx Page 236
  7. Halo 5: Guardians - Level: Reunion
  8. Halo 3

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