Hezbollah is structured like a normal military organization. It has a hierarchical structure and centralized planning and decentralized execution, as is typical, though it has a greater degree of compartmentalization than is normal. "Hezbollah's military wing is hierarchically organized, but operates in a cellular manner with good operational and communications security to avoid detection from Israeli sensors and aerial attack. Hezbollah has flexible tactics and they do not have a tall hierarchical chain of command, instead delegating more authority to local commanders. Autonomous infantry cells with "considerable independence," including choosing when to attack, comprise most of the organization's fighters. Hezbollah leader Hassan Nasrallah explained in a 2013 interview that during the 2006 war they had delegated "freedom of assessment" down to the village level, and that several villages had decided to stand and fight. On the other hand, the Hezbollah high command asserts "firm operational control" over its strategic missile force. The Hezbollah headquarters in Beirut maintains direct control over long range missiles, with control of short and possibly medium range missiles devolved to regional commanders. In the Lebanon war, the Hezbollah high command had enough top down control to completely stop or start rocket attacks. Hezbollah's concept of operations centered around continued short-range rocket attacks against Israel. "Hezbollah proved to be a highly dedicated and professional fighting force... Hezbollah successfully embraced a new doctrine, transforming itself from a predominantly guerilla force into a formidable quasi-conventional fighting force." In general, little is known about Hezbollah's decision making process. The party has made significant investments in its command-and-control infrastructure since 2006.