Final answer:
True. The team captain can be issued a penalty for altering the flow of the game if their team fails to field a Jammer when legally able to do so.
Step-by-step explanation:
True.
According to the rules of roller derby, the team captain is responsible for ensuring that their team fields a Jammer during gameplay. If the team fails to have a Jammer on the track when they are legally able to do so, the team captain can be issued a penalty for altering the flow of the game. This penalty is meant to discourage teams from intentionally disrupting the normal gameplay and strategy of roller derby.