Until recently, the importance of organizational factors in the understanding of the variance of the behavior of state challengers had not been recognized. New studies and theories have underscored its crucial character. This article contends that challengers can be placed in a continuum constituted by two opposed polar types, army like and network associations, and compare the Afghan Taliban's and the Colombian Fuerzas Armadas Revolucionarias de Colombia (Revolutionary Armed Forces of Colombia—FARC)'s organizational principles from this point of view. The main claim is that organizationally inspired explanations behave much better than resource inspired ones when accounting for the differences between the Taliban and the FARC.