Every time a new head coach is hired, a “changing of the guard” takes place. The old guard departs, and the new guard is ushered in. The South Carolina softball program has followed a similar pattern in Ashley Chastain’s first month in charge. [GamecockCentral for $1: In-depth coverage and a great community] Within a week of Chastain’s hire, Gamecock softball filled all four vacancies within its coaching staff and administration. All four had ties to Chastain’s previous coaching destination — the University of North Carolina at Charlotte. A number of player commitments, both from the transfer …