Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in this Registration Statement on Form S-3 of our reports dated February 26, 2019 relating to the financial statements of Vectrus, Inc. and the effectiveness of Vectrus, Inc.'s internal control over financial reporting, appearing in the Annual Report on Form 10-K of Vectrus, Inc. for the year ended December 31, 2018. We also consent to the reference to us under the heading "Experts" in such Registration Statement.

/s/ DELOITTE & TOUCHE LLP

Denver, Colorado

January 2, 2020