Here is the weapon data. Try changing USN to USAF, see if that helps.
WeaponData256]
TypeName=AGM-78A
FullName=AGM-78A Standard ARM
ModelName=agm-78
Mass=655.450012
Diameter=0.300000
Length=4.560000
SubsonicDragCoeff=0.120000
SupersonicDragCoeff=0.222000
AttachmentType=USN
SpecificStationCode=
NationName=USN
StartYear=1968
EndYear=1972
Availability=1
BaseQuantity=24
Exported=FALSE
ExportStartYear=0
ExportEndYear=0
ExportAvailability=0
WeaponDataType=1
RailLaunched=FALSE
RocketPod=FALSE
Retarded=FALSE
FinStabilized=TRUE
SpinStabilized=FALSE
HasGrowl=FALSE
EffectClassName=WpARMissileMarkerEffects
ReleaseDelay=0.000000
WarheadType=0
Explosives=101.000000
FusingDistance=0.000000
ClusterBomblets=0
ClusterDispersion=0.000000
GuidanceType=9
Accuracy=70
MaxTurnRate=3.000000
MaxLaunchG=2.500000
LockonChance=80
LaunchReliability=85
ArmingTime=5.200000
SeekerFOV=25.000000
SeekerGimbleLimit=25.000000
SeekerTrackRate=11.000000
SeekerRange=55000.000000
MinLaunchRange=10000.000000
MaxLaunchRange=55000.000000
Duration=400.000000
CounterCountermeasure=0.000000
NoiseRejection=0.000000
CapabilityFlags=0x10001000
LoftAngle=0.000000
DescentAngle=0.000000
MaxLoftAltitude=0.000000
CLmax=14.000000
MinFreq=0.000000
MaxFreq=0.000000
BoosterStart=0.500000
BoosterDuration=5.200000
BoosterAccel=16.200001
BoosterEffectName=MissileFireEffect
BoosterSoundName=Missile
BoosterNodeName=
BoosterPosition=0.000000,-2.280000,0.000000
SustainerDuration=20.200001
SustainerAccel=8.000000
SustainerEffectName=
SustainerSoundName=
SustainerPosition=0.000000,-2.280000,0.000000
InFlightEffectName=MissileInFlightEffect
InFlightSoundName=
ReleaseAnimationID=-1
EODisplayFlags=0
CEP=0.000000