Palestinian youths swing across a monkey bar during a military-style graduation ceremony after being trained at one of the Hamas-run Liberation Camps, in Gaza City

Palestinian youths swing across a monkey bar during a military-style graduation ceremony after being trained at one of the Hamas-run Liberation Camps, in Gaza City January 29, 2015. Hamas’s armed wing organized “Liberation Youths Camps” for young Palestinians aged between 15 and 21 to prepare them to “confront any possible Israeli attack”, Hamas officials said. According to organizers, some 17,000 youths graduated from these camps. REUTERS/Suhaib Salem (GAZA – Tags: MILITARY POLITICS)