byMikeGreeneCover,©UnitedStatesMarineCorps/GettyImages;p.3,p.7,p.12,©Bettmann/CORBIS;p.4,USMC;p.5,p.6,©CarlIwasaki/TimeLifePictures/GettyImages;p.8,CourtesyoftheNationalArchivesandRecordsAdministration;p.9,©U.S.DepartmentofDefense/CNP/GettyImages;p.10,p.11,©CORBIS;p.13,©MIKETHEILER/AFP/GettyImages;p.14,©APPhoto/JeffKida.Copyright©byHarcourt,Inc.Allrightsreserved.Nopartofthispublicationmaybereproducedortransmittedinanyformorbyanymeans,electronicormechanical,includingphotocopy,recording,oranyinformationstorageandretrievalsystem,withoutpermissioninwritingfromthepublisher.RequestsforpermissiontomakecopiesofanypartoftheworkshouldbeaddressedtoSchoolPermissionsandCopyrights,Harcourt,Inc.,6277SeaHarborDrive,Orlando,Florida32887-6777.Fax:407-345-2418.HARCOURTandtheHarcourtLogoaretrademarksofHarcourt,Inc.,registeredintheUnitedStatesofAmericaand/orotherjurisdictions.PrintedinChinaISBN10:0-15-351446-9ISBN13:978-0-15-351446-3OrderingOptionsISBN10:0-15-351213-X(Grade3AdvancedCollection)ISBN13:978-0-15-351213-1(Grade3AdvancedCollection)ISBN10:0-15-358082-8(packageof5)ISBN13:978-0-15-358082-6(packageof5)Ifyouhavereceivedthesematerialsasexaminationcopiesfreeofcharge,HarcourtSchoolPublishersretainstitletothematerialsandtheymaynotberesold.Resaleofexaminationcopiesisstrictlyprohibitedandisillegal.Possessionofthispublicationinprintformatdoesnotentitleuserstoconvertthispublication,oranyportionofit,intoelectronicformat.1234567891098512111009080706byMikeGreeneItwas1942,andtheUnitedStateshadjustenteredWorldWarII.Soldiersneededtosendmessagesbackandforth.Enemieswerewatching,listening,andtryingtogetinformation.Eachsidehadmachinesthatmadecodes.Thecodeshidsecretmessages.However,thesecodescouldbebroken.3PhilJohnstonwasintheUnitedStatesMarineCorps.AMarineisasoldierwhoservesonbothseaandonland.Johnstonhadanideaforanewcodetocommunicatesecretly.ThecodewouldbeinalanguagecalledNavajo.4TheNavajoareNativeAmericans.PhilJohnstonwasnotaNavajo.HisparentstaughtonthereservationwheretheNavajolived.Joh...
