A special court martial is typically considered a misdemeanor. a general court martial is typically a felony.
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You say you have no restrictions, yet you're still required to register as a sex offender? Ordinarily, a special court martial results in a misdemeanor conviction.
Best of luck
Camp Lejuene? Cherry Point? New River?
You do need to disclose your conviction, as a conviction under the UCMJ is federal in nature. With databases as thorough as they are now, your failure to disclose is more of a problem (and disqualifying) than the conviction itself. The employer may already know about it. Moreover, even if the conviction does not show up now, it may in the future, so hiding it now may set you up for termination later.
As to the level or the offense, or its equivalent in civilian terms under California law, I would call up a military lawyer outside Camp Pendleton, i.e. in Ocenside or San Clemente, and verify the level, as sex offenses have a certain stigma of their own and if you were to report it as a misdemeanor when it is really a felony is problematic.