▁from ▁simpler ▁definitions ▁which ▁emphas ised ▁freedom ▁from ▁military ▁threat ▁and ▁from ▁political ▁co erc ion . ▁Among ▁the ▁many ▁definitions ▁proposed ▁to ▁date ▁are ▁the ▁following , ▁which ▁show ▁how ▁the ▁concept ▁has ▁evol ved ▁to ▁en comp ass ▁non - mil it ary ▁concerns : ▁ ▁" A ▁nation ▁has ▁security ▁when ▁it ▁does ▁not ▁have ▁to ▁sacrifice ▁its ▁legit imate ▁ ín ter ests ▁to ▁avoid ▁war , ▁and ▁is ▁able , ▁if ▁challeng ed , ▁to ▁maintain ▁them ▁by ▁war ." ▁( W alter ▁Li pp mann , ▁ 1 9 4 3 ). ▁ ▁" The ▁distinct ive ▁meaning ▁of ▁national ▁security ▁means ▁freedom ▁from ▁foreign ▁dict ation ." ▁( Har old ▁L ass well , ▁ 1 9 5 0 ) ▁ ▁" National ▁security ▁object ively ▁means ▁the ▁absence ▁of ▁thre ats ▁to ▁acquired ▁values ▁and ▁subject ively , ▁the ▁absence ▁of ▁fear ▁that ▁such ▁values ▁will ▁be ▁attacked ." ▁( Ar n old ▁Wolf ers , ▁ 1 9 6 0 ) ▁ ▁" National ▁security ▁then ▁is ▁the ▁ability ▁to ▁preserve ▁the ▁nation ' s ▁physical ▁integrity ▁and ▁territory ; ▁to ▁maintain ▁its ▁economic ▁relations ▁with ▁the ▁rest ▁of ▁the ▁world ▁on ▁reasonable ▁terms ; ▁to ▁preserve ▁its ▁nature , ▁institution , ▁and ▁govern ance ▁from ▁dis ruption ▁from ▁outside ; ▁and ▁to ▁control ▁its ▁borders ." ▁( Har old ▁Brown , ▁U . S . ▁Secretary ▁of ▁Def ense , ▁ 1 9 7 7 - 1 9 8 1 ) ▁ ▁"