All state enforcement is the same

Username definitely checks out.

Cool people call cops pigs. The comic is saying that the national guard and Marines are also cops, and pigs.

The Black Panthers were targeted by cops, assassinated by cops. States would call in the national guard to violently crush protests and direct actions, such as for civil rights. Marines are the extension of state violence overseas where they act like cops (state violence) enforcing the interests of the US state externally, e.g. mass killing Vietnamese people.