(State or Other Jurisdiction

of Incorporation)

(Commission

File Number)

(IRS Employer

Identification No.)

3750 Centerview Drive

Chantilly, Virginia

An involuntary separation from service initiated by the Company without cause. Cause is defined in the Severance Plan as (i) an intentional failure to perform reasonably assigned duties that the Eligible Employee does not cure within 15 days of receiving written notice of such failure, (ii) personal dishonesty or willful misconduct in the performance of duties, (iii) a breach of fiduciary duties to the Company involving personal profit, (iv) willful violation of any law, rule or regulation in connection with the performance of duties (other than traffic or similar offenses), or (v) any act by an Eligible Employee involving fraud, securities law violations or, in the case of willful or grossly negligent acts, an investigation by the Securities and Exchange Commission (the “Commission”), which the Board determines materially adversely affects the Company or the Eligible Employee’s job performance;

A separation from service for good reason. Good reason is defined as (i) a material reduction in the Eligible Employee’s base salary or annual cash incentive opportunity or, in the case of an executive officer of the Company, long-term incentive opportunity, or an adverse change to the calculation methodology for determining bonuses or, in the case of an executive officer of the Company, long-term incentives, (ii) generally, the failure of the Company to provide employee benefits to the Eligible Employee that are substantially similar to employees of comparable title and position, (iii) a material adverse change to the Eligible Employee’s duties or responsibilities, (iv) a relocation of the Eligible Employee’s principal place of business of 50 miles or more, which also increase his or her commute by at least 25 miles, or (v) a failure to pay any compensation due to the Eligible Employee within 10 days after it is due; or

A separation from service due to death or long-term disability.

Severance Pay. Generally, an Eligible Employee’s base salary and average bonus over the past three years, or such shorter period as the Eligible Employee has been with the Company, multiplied by the applicable severance multiple. The severance multiple is two (2) for the Company’s Chief Executive Officer and Chief Financial Officer, one and one-half (1.5) for each Senior Vice President of the Company, and one (1) for each Vice President of the Company who reports directly or indirectly (through another executive officer) to the Chief Executive Officer. The Eligible Employee will also receive an annual performance bonus, pro-rated through the date of his or her separation from service, plus any earned but unpaid base salary, bonus payments and deferred compensation.

Medical, Dental and Life Insurance. Generally, continuation of the Eligible Employee’s medical, dental and life insurance benefits for a period of years equal to the Eligible Employee’s severance multiple (the “Severance Period”).

Equity Vesting. The acceleration, in an amount proportional to the number of months elapsed between the grant date and the Eligible Employee’s separation from service over the number of months between the grant date and the date on which the award would become fully vested according to its terms, of any unvested stock options, restricted stock units or restricted stock that vest solely based on the passage of time. Performance-based awards shall continue to be determined solely on the basis of the terms of such awards.

Outplacement. Reasonable outplacement services during the Eligible Employee’s Severance Period.

/s/ Thomas O. Miiller