Open up your linebacker II folder then open WOVCAMPL2_DATA.ini and add this over the airunit003. Then you are set.
//----- Player Unit
[AirUnit003]
AircraftType=F-105G
Squadron=17WWS
ForceID=1
Nation=USAF
DefaultTexture=WW
BaseArea=Korat RTAFB
BaseMoveChance=0
RandomChance=100
MaxAircraft=16
StartAircraft=16
MaxPilots=16
StartPilots=16
Experience=100
Morale=100
Supply=50
MissionChance[sWEEP]=0
MissionChance[CAP]=0
MissionChance[iNTERCEPT]=0
MissionChance[ESCORT]=0
MissionChance=10
MissionChance[CAS]=0
MissionChance[sEAD]=100
MissionChance[ARMED_RECON]=40
MissionChance[ANTI_SHIP]=0
MissionChance[RECON]=0
UpgradeType=NEVER
Supply[001].WeaponType=Mk81
Supply[001].Quantity=2880
Supply[002].WeaponType=Mk82
Supply[002].Quantity=1440
Supply[003].WeaponType=Mk84
Supply[003].Quantity=240
Supply[004].WeaponType=LAU-3A
Supply[004].Quantity=480
Supply[005].WeaponType=Mk82SE
Supply[005].Quantity=240
Supply[006].WeaponType=Rockeye
Supply[006].Quantity=360
Supply[007].WeaponType=BLU-1
Supply[007].Quantity=240
Supply[008].WeaponType=AGM-45B
Supply[008].Quantity=640
Supply[009].WeaponType=AGM-78A
Supply[009].Quantity=240
Supply[010].WeaponType=CBU-24B
Supply[010].Quantity=480
Supply[011].WeaponType=f105_450gal_sea
Supply[011].Quantity=480
Supply[012].WeaponType=f105_650gal_sea
Supply[012].Quantity=240