How to worship Mars/Ares?

I’m planning to apply for the French Foreign Legion and you need a war god on my side.

Ethnicity?
I’m a South American castizo (mostly white mestizo)

Have you consulted the Lemegeton? I think that there are some demons in there associated with Mars.

YHWH led Israel to commit literal and cultural genocide against the entirety of Canaan and you want to worship some god whose symbol is a literal pig? A literal Porco Dio?