Externalities are rarely if ever considered in estimating a multiplier effect. This can be a serious issue for military expenditures. For example, the Islamic State of Iraq and the Levant (ISIL) relies mostly on captured weapons. For example, in Mosul between 4 and 10 June 2014 a group of between 500 and 600 ISIL troops "were able to seize six divisions' worth of strategic weaponry, all of it US-supplied" from a force with a paper strength of 120,000 men. In considering the multiplier effect of military expenditures, the people killed and property destroyed are not considered. The only things that are considered are the increased weapon sales to replace those stolen and the costs associated with combatting ISIL. Those are considered as increasing the Gross Domestic Product of the United States, and that is assumed to be good.