What do yellow and red cards mean, and can a red card carry over to Junior Olympics?

Under USA Water Polo Rule WP 26, referees use cards to control coaches, team officials and bench players as well as players in the water:

• Yellow card: an official warning to the head coach. A referee may also show a yellow card to a team when a player keeps playing in an unsporting way or simulates (fakes being fouled). If it continues, the player can be excluded for misconduct.
• Red card: the person must leave the pool area immediately. Disruptive or disrespectful behavior by an assistant coach, team official or bench player is a direct red card.
• If the head coach is sent off, an assistant coach takes over but must stay at the bench (they can still call a timeout).

At USA Water Polo national championships (National Junior Olympics and Champions Cup), under the Conduct of Championships:

• Red cards, brutalities and the resulting suspensions from Zone Qualification Tournaments carry over into the Championship Finals.
• Anyone who gets two red cards, misconducts or brutalities (in any combination) during the Championship Finals is out for the rest of the event.
• If a coach is red-carded and no other rostered coach is present, the team forfeits that game 5-0.