<SEC-DOCUMENT>0001183755-18-000004.txt : 20180808
<SEC-HEADER>0001183755-18-000004.hdr.sgml : 20180808
<ACCEPTANCE-DATETIME>20180808090119
ACCESSION NUMBER:		0001183755-18-000004
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20180807
FILED AS OF DATE:		20180808
DATE AS OF CHANGE:		20180808

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			CARANO BANDEL L
		CENTRAL INDEX KEY:			0001183755

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-34460
		FILM NUMBER:		18999975

	MAIL ADDRESS:	
		STREET 1:		525 UNIVERSITY AVENUE
		STREET 2:		SUITE 1300
		CITY:			PALO ALTO
		STATE:			CA
		ZIP:			94301

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			KRATOS DEFENSE & SECURITY SOLUTIONS, INC.
		CENTRAL INDEX KEY:			0001069258
		STANDARD INDUSTRIAL CLASSIFICATION:	GUIDED MISSILES & SPACE VEHICLES & PARTS [3760]
		IRS NUMBER:				133818604
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1225

	BUSINESS ADDRESS:	
		STREET 1:		4820 EASTGATE MALL
		STREET 2:		SUITE 200
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92121
		BUSINESS PHONE:		858-812-7300

	MAIL ADDRESS:	
		STREET 1:		4820 EASTGATE MALL
		STREET 2:		SUITE 200
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92121

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	WIRELESS FACILITIES INC
		DATE OF NAME CHANGE:	19990817
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2018-08-07</periodOfReport>

    <issuer>
        <issuerCik>0001069258</issuerCik>
        <issuerName>KRATOS DEFENSE &amp; SECURITY SOLUTIONS, INC.</issuerName>
        <issuerTradingSymbol>KTOS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001183755</rptOwnerCik>
            <rptOwnerName>CARANO BANDEL L</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O OAK INVESTMENT PARTNERS</rptOwnerStreet1>
            <rptOwnerStreet2>525 UNIVERSITY AVENUE, SUITE 1300</rptOwnerStreet2>
            <rptOwnerCity>PALO ALTO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94301</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2018-08-07</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>10000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>12.6957</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>616098</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F1"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>12934207</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Represents shares of Common Stock directly owned by Bandel L. Carano.</footnote>
        <footnote id="F2">Represents 267,786 shares of Common Stock beneficially owned by Oak Investment Partners IX, Limited Partnership (&quot;Oak IX&quot;); 2,853 shares of Common Stock beneficially owned by Oak IX Affiliates Fund, Limited Partnership (&quot;Oak IX Affiliates&quot;); 6,427 shares of Common Stock beneficially owned by Oak IX Affiliates Fund-A, Limited Partnership (&quot;Oak IX Affiliates-A&quot;); 1,630,960 shares of Common Stock beneficially owned by Oak Investment Partners X, Limited Partnership (&quot;Oak X&quot;); 26,181 shares of Common Stock beneficially owned by Oak X Affiliates Fund, Limited Partnership (&quot;Oak X Affiliates&quot;); and 11,000,000 shares of Common Stock beneficially owned by Oak Investment Partners XIII, Limited Partnership (&quot;Oak XIII&quot;).</footnote>
        <footnote id="F3">Bandel L. Carano is a Director of the Issuer. Mr. Carano is a Managing Member of Oak Associates IX, L.L.C., the General Partner of Oak IX; a Managing Member of Oak IX Affiliates, L.L.C., the General Partner of Oak IX Affiliates and Oak IX Affiliates-A; a Managing Member of Oak Associates X, L.L.C., the General Partner of Oak X; a Managing Member of Oak X Affiliates, L.L.C., the General Partner of Oak X Affiliates; and a Managing Member of Oak Associates XIII, L.L.C., the General Partner of Oak XIII.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Bandel L. Carano</signatureName>
        <signatureDate>2018-08-08</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
