How do the libero rules work in USA Volleyball?

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Designating liberos (USAV 19.1.1) A team may designate zero, one or two liberos. If you designate two at the start of the match, they are your liberos for the entire match. If you start the match with one or none, you may change who is libero from set to set (or play a set without one), but you can't add a second libero later in the match. Libero numbers go on the lineup sheet for each set. If none is listed, you may still designate one immediately, before the set begins. Playing rules Libero replacements are unlimited and don't count as substitutions. A libero can only be replaced by the player they replaced or by the other libero. There must be a completed rally between two libero replacements, except for injury, a penalty-forced rotation, or when the libero is replacing the right-back player to serve. The libero may serve in one rotation position per set. With two liberos, both must serve in that same position. An illegal replacement caught before the next serve is corrected with a delay sanction. After the serve, it's treated like an illegal substitution. Injured or unable to play One libero: you may redesignate a new libero at any time, for any reason (including disqualification). Two liberos: redesignation is allowed only when both are unable to play. A libero replaced by redesignation can't return to the match. Uniform: the libero's jersey must clearly contrast with, and have a different dominant color from, teammates' jerseys. Shorts may differ.