Palestinian militants from al-Husine brigade loyal to Fatah movement, guard a home-made rocket during a military-style exercise graduation ceremony in Khan Younis in the southern Gaza Strip, September 20, 2015. (Photo by Suhaib Salem/Reuters)





A Palestinian militant from al-Husine brigade loyal to Fatah movement runs after an explosion at a mock Israeli army base during a military-style exercise graduation ceremony in Khan Younis in the southern Gaza Strip, September 20, 2015. (Photo by Suhaib Salem/Reuters)





Palestinian militants from al-Husine brigade loyal to Fatah movement exits from a tunnel during during a military-style exercise graduation ceremony in Khan Younis in the southern Gaza Strip, September 20, 2015. (Photo by Suhaib Salem/Reuters)





Palestinian militants from al-Husine brigade loyal to Fatah movement, climb a net during a military-style exercise graduation ceremony in Khan Younis in the southern Gaza Strip, September 20, 2015. (Photo by Suhaib Salem/Reuters)





A Palestinian militant from al-Husine brigade loyal to Fatah movement stands guard during a military-style exercise graduation ceremony in Khan Younis in the southern Gaza Strip, September 20, 2015. (Photo by Suhaib Salem/Reuters)





Palestinian militants from al-Husine brigade loyal to Fatah movement, guard during a military-style exercise graduation ceremony in Khan Younis in the southern Gaza Strip, September 20, 2015. (Photo by Suhaib Salem/Reuters)





Palestinian militants from al-Husine brigade loyal to Fatah movement is seen during a military-style exercise graduation ceremony in Khan Younis in the southern Gaza Strip, September 20, 2015. (Photo by Suhaib Salem/Reuters)





Palestinian militants from al-Husine brigade loyal to Fatah movement, run during a military-style exercise graduation ceremony in Khan Younis in the southern Gaza Strip, September 20, 2015. (Photo by Suhaib Salem/Reuters)





A Palestinian militant from al-Husine brigade loyal to Fatah movement exits from a tunnel during a military-style exercise graduation ceremony in Khan Younis in the southern Gaza Strip, September 20, 2015. (Photo by Suhaib Salem/Reuters)





Palestinian militants from al-Husine brigade loyal to Fatah movement is seen during a military-style exercise graduation ceremony in Khan Younis in the southern Gaza Strip, September 20, 2015. (Photo by Suhaib Salem/Reuters)





Palestinian militants from al-Husine brigade loyal to Fatah movement, run during a military-style exercise graduation ceremony in Khan Younis in the southern Gaza Strip, September 20, 2015. (Photo by Suhaib Salem/Reuters)





A Palestinian militant from al-Husine brigade loyal to Fatah movement runs after an explosion at a mock Israeli army base during a military-style exercise graduation ceremony in Khan Younis in the southern Gaza Strip, September 20, 2015. (Photo by Suhaib Salem/Reuters)