Welcome to Halo Answers. What would you like to know?

Three the original Project:ORION, Dr.Halsey's SPARTAN-II Program, Colenol Ackersons SPARTAN-III Program, Hopr this answers your question.

In other words, only 3. :3

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.