Mine was rather special... Has a loong story to it... At first, I was trying to design a ship that could get me to the mun, and was not very successful with it. 3 fails in succession, and I quit trying. My friend, at the time, was into designing robots/drones to go around Kerbal. So I got into it, and designed a "Hover drone" which I used to get the the abandoned airport. After a while, drone designing really did not suit me, and my friend was always able to be more successful that me. So, I got back into Mun expedition, however this time, I asked my friend to design a compact drone to suit a small rocket. The second i looked at it, I knew it was it. It was a tiny, drone, suited for many different things. 4 wheels, a battery backpack, and solar panels diagonally attached to the back ram of the wheels. I immediately got to designing a landing craft for the drone, and it worked out great, and for once, I beat my friend at the design. Next, came the rocket design, and that's really when my friend wanted to challenge me in the race to the mun. Neither of us ever got there, however he was the closest to getting to it (Crashed at 4000m/s) My rocket was a fancy, drone carrier, and consisted of 4 drone slots. I planned to get close to the muns orbit, and deploy the "Hover drone" to mark out the landing area; however it failed miserably due to the lack of power. So, all I had left at the time, is 1 landing drone. My friend at the time, was designing a carrier for a rather huge drone. However, due to the carrying problems, he had to abandon the idea and focus on getting a Kerbal on to the mun. This gave me an even bigger time advantage over him. As he was designing the Mun Lander, I was launching my last drone into space. I took it very slowly, and eventually, got a feeling that I might actually make it. Eventually, after 15 minutes of slow approach, I managed to land the Drone Carrier, deploy the Scout Drone, and for once, beat my friend at KSP. He made it the next day. So, the "Scout Drone" was the first operational thing I managed to get onto Mun.