Members of the Brazilian Navy, in chemical suits, take part in an exhibition showcasing their operational capacity to combat attacks and riots, ahead of the World Youth Day in Rio de Janeiro July 19, 2013. Pope Francis will travel to Brazil on his first international trip as pontiff in July. The main purpose of the trip is for the pope to preside at the Catholic Church's World Day of Youth. The pope's participation in World Youth Day events starts on the evening of July 25 in Rio's famed Copacabana Beach area and culminates with a huge open-air Mass in the Guaratiba area of the city on July 28.[Photo/Agencies]