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Space


National Mission Model

Since program inception in 1995, the total number of launches contained in the Air Force's Evolved Expendable Launch Vehicle (EELV) mission model has fluctuated from 171 to 194 to 204 to 169 to 183. The types of launch vehicles--medium-lift, intermediate-lift, and heavy-lift--and the timing of launches have also varied.

                           Air Force EELV Mission Model and 
                                    GAO Adjusted Model
                                                                               GAO
    Type of Launch  Satellite       Dec.  Sept. July     Mar. 9,     Mar.24,   adjusted
    vehicle         system          1995  1996  1997        1998        1998   model
    --------------  --------------  ----  ----  ----  ----------  ----------  ------
    Medium          Space test         7     6     6           5           5       5
                     satellites
                    GPS               55    53    53          40          56      56
                    DMSP               4     4     5           4           4       4
                    NPOESS             9     9     8           6           5       5
                    NASA               6     7     3           2           2       0
                     satellites
                    NASA-              9     9     5           5           5       0
                     Discovery
                    SBIRS-LEO          0    28     0           9           9       9
    ================================================================================
    Subtotals                         90   116    80          71          86      79
    Intermediate    DSCS               2     2     2           2           2       2
                    SBIRS-GEO         16    15    14          10          10      10
                    SBIRS-LEO          0     0    29           0           0       0
                    Advanced          21    21    20          21          20      20
                     MILSATCOM
                    Mission A/B/E     25    25    50          56          56      44
    ================================================================================
    Subtotals                         64    63   115          89          88      76
    Heavy           Mission C/D       17    15     8           8           8       8
                    DSP                0     0     1           1           1       1
    ================================================================================
    Subtotals                         17    15     9           9           9       9
    ================================================================================
    Totals                           171   194   204         169         183     164
    --------------------------------------------------------------------------------
    LEGEND
    DMSP = Defense Meteorological Satellite Program
    DSCS = Defense Satellite Communications System
    DSP = Defense Support Program
    GPS = Global Positioning System
    MILSATCOM = Military Satellite Communications
    Mission A/B/C/D/E = Classified programs
    NPOESS = National Polar-orbiting Operational Environmental Satellite
    System
    SBIRS-GEO = Space-Based Infrared System-Geosynchronous Earth Orbit
    SBIRS-LEO = Space-Based Infrared System-Low Earth Orbit
    

[SOURCE EELV RFP ANNEX C EELV PROGRAM SYSTEM PERFORMANCE DOCUMENT (SPD)]


EELV Transition Schedule




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