POWER OF ATTORNEY

    Know all by these presents, that the undersigned hereby constitutes and
appoints Delphine Van Brussel the undersigned's true and lawful attorney-in-fact
to:

1.  execute for and on behalf of the undersigned, in the undersigned's
    individual capacity, Forms 3, 4, and 5 in accordance with Section 16(a) of
    the Securities Exchange Act of 1934, as amended, and the rules and
    regulations promulgated thereunder (the "Exchange Act");

2.  do and perform any and all acts for and on behalf of the undersigned that
    may be necessary or desirable to complete and execute any Forms 3, 4, or 5,
    including filing and applying for and updating any accession, CCC, and CIK
    filing codes (including filing SEC Form ID (or any similar form)), complete
    and execute any amendment or amendments thereto, and timely file such form
    with the U.S. Securities and Exchange Commission and any stock exchange or
    similar authority; and

3.  take any and all other actions of any type whatsoever in connection with the
    foregoing that, in the opinion of such attorney-in-fact, may be of benefit
    to, in the best interest of, or legally required by, the undersigned, it
    being understood that the documents executed by such attorney-in-fact on
    behalf of the undersigned pursuant to this Power of Attorney shall be in
    such form and shall contain such terms and conditions as such attorney-in-
    fact may approve in such attorney-in-fact's discretion.

    The undersigned hereby grants to such attorney-in-fact full power and
authority to do and perform any and every act and thing whatsoever requisite,
necessary, or proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as the undersigned might or
could do if personally present, with full power of substitution or revocation,
hereby ratifying and confirming all that such attorney-in-fact, or such
attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be
done by virtue of this power of attorney and the rights and powers herein
granted.  The undersigned acknowledges that the foregoing attorney-in-fact, in
serving in such capacity at the request of the undersigned, are not assuming any
of the undersigned's responsibilities to comply with Section 16 of the Exchange
Act.

    This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4, and 5 with respect to the
undersigned's holdings of and transactions in securities issued by Telos
Corporation unless earlier revoked by the undersigned in a signed writing
delivered to the foregoing attorney-in-fact.

    IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed on April 6th, 2021.

/s/ John Porter
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John Porter