TheGerman-shepherdbreedisthemostnumerousintheworldanditbecametheNo1choiceforpolicework,beingusedfortrackingcriminals,patrollingtroubledareas,anddetectionandholdingofsuspects.AdditionallythousandsofGermanShepherdshavebeenusedbythemilitary.Usuallytrainedforscoutduty,theyareusedtowarnsoldierstothepresenceofenemiesorofboobytrapsorotherhazards.GermanShepherdshavebeentrainedbymilitarygroupstoparachutefromaircraft. 　　TheGermanShepherdDogisoneofthemostwidelyusedbreedsinawidevarietyofscent-workroles.Theseincludesearchandrescue,cadaversearching,narcoticsdetection,explosivesdetection,accelerantdetection,andminedetectiondog,amongstothers.Theyaresuitedfortheselinesofworkbecauseoftheirkeensenseofsmellandtheirabilitytoworkregardlessofdistractions. 　　AtonetimetheGermanShepherdDogwasthebreedchosenalmostexclusivelytobeusedasaguidedogforthevisuallyimpaired.Inrecentyears,LabradorandGoldenRetrievershavebeenmorewidelyusedforthiswork,althoughtherearestillGermanShepherdsbeingtrained.Aversatilebreed,theyexcelinthisfieldduetotheirstrongsenseofduty,theirmentalabilities,theirfearlessness,andtheirattachmenttotheirowner. 　　GermanShepherdDogsareusedforherdingandtendingsheepgrazinginmeadowsnexttogardensandcropfields.Theyareexpectedtopatroltheboundariestokeepsheepfromtrespassinganddamagingthecrops.InGermanyandotherplacestheseskillsaretestedinutilitydogtrialsalsoknownasHGH(Herdengebrauchshund)herdingutilitydogtrials.