Exhibit 99.3

MERCURY COMPUTER SYSTEMS, INC

UNAUDITED PRO FORMA CONDENSED COMBINED BALANCE SHEET

SEPTEMBER 30, 2011

(In thousands)

MERCURY COMPUTER SYSTEMS, INC.

UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF OPERATIONS

FOR THE THREE MONTHS ENDED SEPTEMBER 30, 2011

(In thousands, except per share data)

MERCURY COMPUTER SYSTEMS, INC.

UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENT OF OPERATIONS

FOR THE TWELVE MONTHS ENDED JUNE 30, 2011

(In thousands, except per share data)

Mercury Computer Systems, Inc.

Notes to Unaudited Pro Forma Condensed Combined Financial Statements

(In thousands)

1. Background and Basis of Pro Forma Presentation

On December 22, 2011, Mercury Computer Systems, Inc. (“Mercury “ or the “Company”) and King Merger Inc., a newly formed, wholly-owned subsidiary of Mercury (the “Merger Sub”), entered into an Agreement and Plan of Merger (the “Merger Agreement”) with KOR Electronics (“KOR”), and Shareholder Representative Services LLC, as the securityholders’ representative. On December 30, 2011, the transaction closed with the Merger Sub being merged with and into KOR with KOR continuing as the surviving company and a wholly-owned subsidiary of Mercury (the “Merger”). By operation of the Merger, Mercury acquired both KOR and its wholly-owned subsidiary, Paragon Dynamics, Inc. (“PDI”).

The Unaudited Pro Forma Condensed Combined Balance Sheet as of September 30, 2011 and the Unaudited Pro Forma Condensed Combined Statement of Operations for the three months ended September 30, 2011 and the year ended June 30, 2011 are derived from the historical financial information of KOR after giving effect to the pro forma adjustments relating to the Merger.

The Merger is reflected in the Unaudited Pro Forma Condensed Combined Financial Statements utilizing the acquisition method of accounting in accordance with Financial Accounting Standards Board Accounting Standards Codification 805, Business Combinations (ASC 805). Under the acquisition method of accounting, the purchase price is allocated to the tangible and identifiable intangible assets acquired and liabilities assumed based on their estimated fair values. The excess of the purchase consideration over the net tangible and identifiable intangible assets acquired and liabilities assumed was recorded as goodwill. The fair value guidance requires that the fair value measurements reflect the assumptions market participants use in pricing an asset or liability based on the best information available. Estimates of the fair values of KOR have been combined with the historical values of the assets and liabilities of Mercury in the pro forma financial information. The purchase price allocation is preliminary and may be subject to change prior to finalization.

The Unaudited Pro Forma Condensed Combined Statements of Operations for the three months ended September 30, 2011 and the year ended June 30, 2011 assume the Merger occurred on July 1, 2010.

Under ASC 805, acquisition related transaction costs (such as advisory, legal, valuation, and other professional fees) are not included as a component of consideration transferred and are excluded from the Unaudited Pro Forma Condensed Combined Statements of Operations. The Company will incur total acquisition related transaction costs of approximately $583 related to its acquisition of KOR.

The Unaudited Pro Forma Condensed Combined Financial Statements do not reflect any operating efficiencies, synergies or cost savings that the Company may achieve, or any additional expense that may be incurred with respect to the combined company.

2. Pro Forma Adjustments

The Unaudited Pro Forma Condensed Combined Balance Sheet has been prepared to illustrate the effect of the Merger as if it had occurred on September 30, 2011.

The Unaudited Pro Forma Condensed Combined Statements of Operations for the three months ended September 30, 2011 and the year ended June 30, 2011 assume the Merger occurred on July 1, 2010.

All pro forma adjustments have been prepared for informational purposes only. The historical financial statements have been adjusted to give effect to pro forma events that are (i) directly attributable to the Merger, (ii) factually supportable, and (iii) with respect to the statement of operations, expected to have a continuing impact on the combined results of the companies.

The pro forma combined consolidated tax liability does not necessarily reflect the amounts that would have resulted had the Company and KOR filed consolidated income tax returns during the periods presented.

The pro forma adjustments included in the Unaudited Pro Forma Condensed Combined Financial Statements are as follows:

Mercury Computer Systems, Inc.

Notes to Unaudited Pro Forma Condensed Combined Financial Statements (Continued)

(In thousands)

The acquired finite-lived intangible assets include the following:

The pro forma adjustment to intangibles includes the following:

The pro forma adjustment to deferred tax includes the following:

Mercury Computer Systems, Inc.

Notes to Unaudited Pro Forma Condensed Combined Financial Statements (Continued)

(In thousands)

The historical Condensed Consolidated Statements of Operations of KOR include amortization for the period of July 1, 2010 through June 30, 2011 and for the period July 1, 2011 through September 30, 2011 of $271 and $68, respectively. Accordingly, the Company recorded pro forma adjustments of $1,717 and $429 for the twelve months ended June 30, 2011 and three months ended September 30, 2011, respectively.