(4)　As used herein, EBITDA is income (loss) from operations plus depreciation and amortization. EBITDA is frequently used by securities analysts and is presented here to provide additional information about the Company's operations. EBITDA should not be considered as an alternative to net income (loss) as a measure of the Company's operating performance or as an alternative to cash flows as a measure of the Company's liquidity and may not be comparable to similarly titled measures of other companies.

(5)　As used herein, firm backlog represents the total dollar value of all contracts (including estimated contract escalation) net of costs incurred and profits recorded for which the Company has signed contracts with its customers but exclusive of unexercised options (including the respective estimated contract escalation) within those contracts.

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