Related Clues:

• Credit and student, e.g
• Ballpark arbiters, briefly
• Fenway arbiters
• MIT leaves army equipment for student bodies
• Diamond heads?
• Officials at cricket match
• Ones making some safe decisions?
• Works a game, perhaps
• Officials on a diamond
• Some Little League volunteers
• Out callers
• Wrigley Field judges
• They may have many chapters
• Callers of strikes and balls
• Face-mask wearers