<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2021-09-09</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001855485</issuerCik>
        <issuerName>First Light Acquisition Group, Inc.</issuerName>
        <issuerTradingSymbol>FLAG</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001189193</rptOwnerCik>
            <rptOwnerName>RUETTGERS MICHAEL C</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O FIRST LIGHT ACQUISITION GROUP, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>11110 SUNSET HILLS ROAD #2278</rptOwnerStreet2>
            <rptOwnerCity>RESTON</rptOwnerCity>
            <rptOwnerState>VA</rptOwnerState>
            <rptOwnerZipCode>20190</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>true</isDirector>
        </reportingOwnerRelationship>
    </reportingOwner>

    <remarks>Exhibit 24.1 Power of Attorney</remarks>

    <ownerSignature>
        <signatureName>/s/ William J. Weber, Attorney-In-Fact for Michael C. Ruettgers</signatureName>
        <signatureDate>2021-09-09</signatureDate>
    </ownerSignature>
</ownershipDocument>
