sentences:  One perceived benefit of the Reagan Doctrine was the relatively low cost of supporting guerrilla forces compared to the Soviet Union's expenses in propping up client states.Another benefit was the lack of direct involvement of American troops, which allowed the United States to confront Soviet allies without sustaining casualties.Especially since the September 11 attacks, some Reagan Doctrine critics have argued that, by facilitating the transfer of large amounts of weapons to various areas of the world and by training military leaders in these regions, the Reagan Doctrine actually contributed to "blowback" by strengthening some political and military movements that ultimately developed hostility toward the United States, such as al-Qaeda in Afghanistan.