Are you seeing something about different levels of the CA Seal of Biliteracy on a state website or on your district’s site? This FAQ (https://www.cde.ca.gov/sp/el/er/ssbfaq.asp) seems current as of 2017 and does not mention a variety of seals. I am not finding anything at the state level about “Seal of Biliteracy for Service, Participation, Attainment, Diploma”. If this is something your school or district awards, it is nice to have, but not something that will get him into elite schools.
There is an Assembly Bill 24 that passed and establishes a State Seal of Civic Engagement. But, that says the criteria need to be set by 2020, which is a ways off. (And it is not related to languages.)
I found a Golden State Seal Merit Diploma for merit in 6 subjects. That was from 1996 and I didn’t hear anything about it when my son was in HS. Maybe other HSs still do it. Sounds like just another one of those cords and certificates they hand out like candy at the end of senior year.
(My son did not get certified as a translator or do any type of language immersion. Our high schools do train students who are native Spanish speakers as translators. This is especially useful for events attended by parents who don’t speak English. It is a great program that keeps students engaged in school who would otherwise be at risk of dropping out.)
Anyway, I would caution you that district/county level certificates aren’t likely to get someone into Ivy/elite colleges without other factors.
If he is truly interested in the military and is already proficient in Spanish, he might consider a 3rd language that would be useful to the military such as Chinese, Russian, or Arabic. You could see if any of those are available at your local community college.