DEFSEC TECHNOLOGIES — Regulatory Filings 2022

Nov 25, 2022

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November 25, 2022

British Columbia Securities Commission Alberta Securities Commission Financial and Consumer Affairs Authority of Saskatchewan The Manitoba Securities Commission Ontario Securities Commission New Brunswick Financial and Consumer Services Commission Nova Scotia Securities Commission Office of the Superintendent of Securities, Prince Edward Island Office of the Superintendent of Securities, Service Newfoundland and Labrador

Dear Sirs/Madames:

Re: KWESST Micro Systems Inc. (the “Issuer”)

We refer to the amended and restated short form base PREP prospectus of the Issuer dated November 25, 2022 (the “ Prospectus ”) relating to the offering of units of the Company (the “ Offering ”), filed by the Company under the securities acts of each of the provinces of Canada, except Quebec (the “ Canadian Acts ”).

We consent to being named in the Prospectus and to the use through incorporation by reference in the Prospectus on the audited financial statements, the notes thereto and the auditor’s report thereon for the nine-month period ended September 30, 2020.

We report that we have read the Prospectus and all information specifically incorporated by reference therein and have no reason to believe that there are any misrepresentations in the information contained therein that are derived from the financial statements upon which we have reported or that are within our knowledge as a result of our audit of such financial statements. We have complied with Canadian generally accepted standards for an auditor’s consent to the use of a report of the auditor included in an offering document, which does not constitute an audit or reviewof theprospectus as theseterms are described in theCPACanada Handbook – Assurance.

Sincerely,

Kreston GTA LLP

Chartered Professional Accountants, Licensed Public Accountants Markham, Canada