Stanley McChrystal describes the Taliban as a "uniquely 21st-century threat":
Over time, it became increasingly clear -- often from intercepted communications or the accounts of insurgents we had captured -- that our enemy was a constellation of fighters organized not by rank but on the basis of relationships and acquaintances, reputation and fame. Who became radicalized in the prisons of Egypt? Who trained together in the pre-9/11 camps in Afghanistan? Who is married to whose sister? Who is making a name for himself, and in doing so burnishing the al Qaeda brand?