<S:Envelope xmlns:S="http://schemas.xmlsoap.org/soap/envelope/">
   <S:Body>
      <ns2:listUsersResponse xmlns:ns2="http://webservice.services.hitss.com/">
         <return>
            <usrCreationdate>2017-11-17T00:00:00-05:00</usrCreationdate>
            <usrEtaid>1</usrEtaid>
            <usrId>1</usrId>
            <usrLastname>Watts</usrLastname>
            <usrName>Michael</usrName>
            <usrPassword>mypass</usrPassword>
            <usrUsername>michaelwatts</usrUsername>
         </return>
         <return>
            <usrCreationdate>2017-11-17T00:00:00-05:00</usrCreationdate>
            <usrEtaid>1</usrEtaid>
            <usrId>3</usrId>
            <usrLastname>Lamport</usrLastname>
            <usrName>Caroline</usrName>
            <usrPassword>mypass</usrPassword>
            <usrUsername>carolinelamport</usrUsername>
         </return>
      </ns2:listUsersResponse>
   </S:Body>
</S:Envelope>

List<User> users = new List<User>;
users = getUserList(); //getUserList return List<User>
for (int i = 0; i < users.size(); i++) {
        System.out.println(users.get(i).usrName);
        //For example
    }