- UphillMercury
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Don't do anything you wouldn't want to have to explain to paramedics. Trust me, I'm a pilot.
There are several differences between S-IIs and S-IIIs.
S-IIs had a longer training period than the S-IIIs, as others have said, by about two years. They were all issued with MJOLNIR armor. They were selected through a very strict genetic screening process. Finally, they have more experience.
S-IIIs had a shorter, tougher training program, that could be considered on par with the S-II training program. They were issued with cheaper SPI armor because of costs; one suit of MJOLNIR costs as much as a small starship, so doing this with 300 spartans (on average) 3 times over is not very cost-effective. The genetic screening process was very lax, and the only real determining factor to becoming a spartan was if the candidate agreed. The augmentations that the S-IIIs went through was a lot safer, as improvements were made to remove the risky surgery the S-IIs went through and allowed the process to be done entirely by injections, allowing for a 100% success rate. The S-IIIs would most likely be smaller though, as they were not given the thyroid implant inserted in the S-IIs that stimulated growth. Finally, in terms of experience, the program was created later, so they would have less experience than the S-IIs.