How do the umpires change positions ?
Crews frequently change over the course of the year as umpires are sometimes detached from their crew ( so they do not work in their home city with some exceptions , such as the opening of a new stadium ) , are on vacation , or are injured.a ) " Acting crew chief for 36 Tim McClelland ( DL ) " < br > b ) " Acting crew chief for 37 Gary Darling ( DL ) " < br > " Other umpires on the DL include 11 Tony Randazzo , 34 Sam Holbrook "