In DCS the drone (RB06) is one aircraft and the towed target (SM9A) is another.
These need to be in separate groups and the towed target needs to be set to follow the drone at the right distances.
In DCS there is no wire between the drone and the towed target, this wire is not very visible in real life either as far as I can see in image RB06_7.jpg.

The drone is in reality launced with a rocket booster and recovered with a parachute, these are not modeled so 
the drone and the towed target should only be started in the air and deactivated before landing. 
Perhaps it can take of and land in DCS but it will look wierd if it works.
The launching of the drone can be simulated with waypoints making it climb like it was launched with the booster.
The extending of the towed target can perhaps be simulated by activating it just behind the drone at slow speed causing it to fall back to the 
right distance before it starts to follow. If this dont work it can be activated at the right distance right away when the drone enters a trigger zone.

Textures are in 4k, they can be reduced to save performance.

Always set flight task to Nothing.
Always set Reaction To Threat to No Reaction and also set no use of chaff/flares.
Always set Unlimited Fuel as first waypoint task at the starting waypoint.
Always set RTB On Bingo Fuel to No.
For the towed target, set waypoint task to Follow.
Turn radio off.

The towed target shall most likely be towed 50 meters (164 ft) behind the drone.
It shall also most likely be towed about 12 meters (40 ft) below the altitude of the drone.

RB06 is the Swedish designation for the American MQM-107.
The modeled version is MQM-107B.

SM9A is a Swedish towed target called "Släpmål 9A" meaning "Trailing Target 9A" in English. It is provided with a livery for USAF just to remove
the text SM9A because I dont think USAF used that Swedish target but some other that I have not modeled.

The fires on the crashing RB06 can be turned off by commenting out the second fire under fires_pos in the RB06_CW.lua.
I could not get only the fuselage to burn during the crash.