Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the use in this Registration Statement on Form S-1 of our report dated December 29, 2014, relating to the financial statements and financial statement schedule of Alion Science and Technology Corporation and subsidiaries (the “Company”) appearing in the Prospectus, which is part of this Registration Statement.

We also consent to the reference to us under the heading “Experts” in such Prospectus.

/s/ DELOITTE & TOUCHE LLP

McLean, Virginia

April 28, 2015