Since 2006 and especially the group's involvement in the Syrian Civil War, Hezbollah has engaged in a massive manpower buildup. Some observers suggest it has decreased the organization's quality, though Hezbollah fighters claim this is not the case. Since 2006, the group has built training camps in Lebanon focusing on urban warfare. Experienced fighters rotate from the front lines to instructor roles in training camps. Agents from Iran's Ministry of Intelligence train Hezbollah as well, and North Korean instructors possibly participated in the 1980s and 1990s. Training by the IRGC is described as serious and in-depth. The Syrian regime was involved in Hezbollah's training for decades, but since the start of the Syrian Civil War the pattern has reversed, and Hezbollah now "provides training, advice and extensive logistical support to the Government of Syria." In response to the high manpower demands of the Syrian Civil War, the group has reportedly shortened its background check and training regimens for new recruits, though the quality remains high.