In sum, the factor most strongly associated with survivability in Desert Storm appears to have been the combination of flying high and flying at night--an environment that the F-117s operated in exclusively.
(the factor; most strongly associated; with survivability in Desert Storm) (the factor most strongly associated with survivability in Desert Storm; appears; L:In sum) (the factor most strongly associated with survivability in Desert Storm; to have been; the combination of flying high and flying at night) (an environment; operated exclusively; the F-117s)
the factor the factor most strongly associated with survivability in Desert Storm the factor most strongly associated with survivability in Desert Storm an environment
most strongly associated appears to have been operated exclusively
with survivability in Desert Storm
L:In sum
the combination of flying high and flying at night
the F-117s