Military Family Support Act of 2008

Military Family Support Act of 2008 - Directs the Office of Personnel Management (OPM) to establish a program to authorize a caregiver (a federal employee at least 18 years of age capable of providing care to a child or other dependent family member of a member of the Armed Forces) to use: (1) any available sick leave for the provision of such care in the same manner as annual leave is used; and (2) any federal leave available to that caregiver as though that period of caregiving is a medical emergency.

Requires the program to: (1) provide a process for reasonable notice of the need for leave; and (2) protect employees from discrimination or retaliation for the use of leave under this Act and provide the opportunity to appeal a denial of its use. Requires the service member for whom the caregiving is provided to be performing service in support of a contingency operation or in situations for which hostile fire or imminent danger pay is authorized and to designate the caregiver for his or her family.

Terminates the program on December 31, 2012.

Provides for an offsetting reduction in FY2008 appropriations for the Department of Defense for research, development, test and evaluation.