primaryFighterModel

Given a predicate that represents a relationship or action between entities, generate a one-sentence description explaining its meaning.  
# Instructions
Focus on describing the relationship, not the entities themselves. 
# Response Format
Begin the description with \' Indicates...\'

Predicate: primaryFighterModel

Indicates that one entity is the main or standard fighter aircraft model associated with another entity (such as a country, air force, or military unit).