▁had ▁stopped ▁any ▁terror ▁attacks . ▁ ▁U . S . ▁Army ▁General ▁Keith ▁B . ▁Alexander , ▁then ▁director ▁of ▁the ▁NS A , ▁said ▁in ▁June ▁ 2 0 1 3 , ▁" Th ese ▁le aks ▁have ▁caused ▁significant ▁and ▁irre vers ible ▁damage ▁to ▁our ▁nation ' s ▁security ." ▁He ▁added ▁that ▁" the ▁ir respons ible ▁release ▁of ▁class ified ▁information ▁about ▁these ▁programs ▁will ▁have ▁a ▁long - term ▁det r iment al ▁impact ▁on ▁the ▁intelligence ▁community ' s ▁ability ▁to ▁detect ▁future ▁attacks ." ▁ ▁In ▁June ▁ 2 0 1 4 , ▁Alexander ' s ▁recently ▁installed ▁successor ▁as ▁the ▁NS A ' s ▁director , ▁U . S . ▁Navy ▁Admir al ▁Michael ▁S . ▁Rog ers , ▁said ▁that ▁while ▁some ▁terror ist ▁groups ▁had ▁alter ed ▁their ▁communic ations ▁to ▁avoid ▁surve ill ance ▁techniques ▁revealed ▁by ▁Snow den , ▁the ▁damage ▁done ▁overall ▁did ▁not ▁lead ▁him ▁to ▁conclude ▁that ▁" the ▁sky ▁is ▁falling ." ▁Con ced ing ▁there ▁was ▁no ▁absolute ▁protection ▁against ▁le aks ▁by ▁a ▁dedicated ▁ins ider ▁with ▁access ▁to ▁the ▁ag ency ' s ▁networks , ▁Rog ers ▁said ▁the ▁NS A ▁must ▁never theless ▁" ensure ▁that ▁the ▁volume " ▁of ▁data ▁taken ▁by ▁Snow den ▁" can ' t ▁be ▁st olen ▁again ." ▁ ▁Fall out ▁▁ ▁Short ly ▁after ▁the ▁dis clos ures ▁were ▁published , ▁President ▁Ob ama ▁assert ed ▁that ▁the ▁American ▁public ▁had ▁no ▁cause ▁for