▁plans ▁into ▁the ▁hands ▁of ▁an ▁unknown ▁advers ary . ▁This ▁... ▁was ▁the ▁most ▁significant ▁bre ach ▁of ▁U . S . ▁military ▁computers ▁ever ▁and ▁it ▁served ▁as ▁an ▁important ▁w ake - up ▁call ", ▁Lyn n ▁wrote ▁in ▁an ▁article ▁for ▁Foreign ▁Affairs . ▁Operation ▁Buck shot ▁Yan kee , ▁conducted ▁by ▁the ▁United ▁States ▁in ▁response ▁to ▁the ▁ 2 0 0 8 ▁bre ach ▁which ▁was ▁alleg edly ▁conducted ▁by ▁Russia . ▁This ▁operation ▁last ed ▁three ▁years , ▁starting ▁in ▁October ▁of ▁ 2 0 0 8 ▁when ▁the ▁bre ach ▁was ▁first ▁detected . ▁The ▁operation ▁included ▁attempts ▁to ▁recognize ▁and ▁mit ig ate ▁the ▁mal icious ▁code ▁( Agent . bt z ), ▁which ▁had ▁spread ▁to ▁military ▁computers ▁around ▁the ▁world . ▁The ▁team ▁conduct ing ▁the ▁operation ▁requested ▁permission ▁to ▁use ▁more ▁off ensive ▁means ▁of ▁comb ating ▁the ▁code , ▁but ▁it ▁was ▁denied ▁by ▁senior ▁officials . ▁Operation ▁Buck shot ▁Yan kee ▁was ▁a ▁catal yst ▁for ▁the ▁formation ▁of ▁Cy ber ▁Command . ▁On ▁ 9 ▁February ▁ 2 0 0 9 , ▁the ▁White ▁House ▁announced ▁that ▁it ▁will ▁conduct ▁a ▁review ▁of ▁the ▁nation ' s ▁cy ber ▁security ▁to ▁ensure ▁that ▁the ▁Federal ▁government ▁of ▁the ▁United ▁States ▁cy ber ▁security ▁initi atives ▁are ▁appropri ately ▁integrated , ▁res our ced ▁and ▁coordin ated ▁with ▁the ▁United ▁States ▁Congress ▁and ▁the ▁private ▁sector . ▁On ▁ 1 ▁April ▁ 2 0 0 9 , ▁U .