Which modern frigate fills the Apollo's quantity role?

What is the modern equivalent of a second-class protected cruiser?

Constellation-class and Oliver Hazard Perry-class frigates are offered as examples, while viewers are invited to propose other ships that combine credible first-line capability with affordable numbers.

The closing question asks which modern warship is capable enough to matter in a first-line fleet yet simple and affordable enough to sustain presence in numbers. Constellation-class and Oliver Hazard Perry-class frigates are offered as examples rather than a closed answer. The comparison concerns force structure, deployment coverage, and the relationship between unit capability and fleet size. It gives viewers a concrete test for comparing modern frigate programs with the Apollo class's nineteenth-century role.