I spent a full day and evening working with the local Sheriff SWAT team, training them on the tactical deployment of drones. They had a brand new M2E that had been donated to them. First up was an outdoor assessment of the skills of the 2 designated LE pilots. One had just passed his 107 and was a competent pilot. The second had never touched a drone. I spent most of that preliminary time (3 batteries worth) with the second pilot on my Spark on basic flying skills. By the end of the 3rd battery, he was flying decent figure 8s and manual orbits.
We then moved for several hours to indoor tactical flights with my Mavic Air and prop guards. I was not sure how far the signal would reach through multiple doors and hallways and did a test. I was astonished to see it went through multiple hallways and walls with virtually no signal loss. I then trained them on flying the drone down hallways and clearing rooms with it. For that training, I was a remote VO, staying with the drone, in radio contact with them. VOs were a necessity. A second person to act as another VO to help me would have been invaluable (I was training them by myself.) If I had it to do over, I'd bring someone else to help me - i.e., for indoor flights, a VO to be with the drone in radio contact with me while I stay with the pilot as a second VO.
[For the naysayers that poo-poo drones as worthless for indoor tactical ops because they are easily disabled by the bad guys - yes, the bad guys can obviously and easily swat a drone down.
However, you then have valuable intelligence precisely knowing where the bad guy is. Plus, you may get more actionable intelligence before they take down the drone - i.e., you're able to see there are two bad guys (not just one) and with a hostage, etc.]
Once they had that skill down, they practiced incorporating it into their SWAT team tactics. The pilot would be last in the SWAT team lineup as they entered the building. When the team commander (who was first) asked for drone support, the team would kneel down and the pilot launched the drone over their heads to fly ahead of them. As they progressed, the pilot stayed at the rear of the line and the team followed the drone, with the pilot keeping them apprised what he could see on the display. We realized an after-market add-on LED light source on the drone was pretty much a necessity in case the power/lights in the building were out.
Next, we moved to a 2 story building downtown that was empty. They wanted to try flying it through a second story window from the ground and clear the building from outside (which the 107 pilot clearly had the skill to do). However, the wind was too strong and unpredictable to safely get it through the window with the swirling wind around the downtown buildings and I nixed that idea (especially since it was my Mavic Air.) While it would have been worth the risk in a real-world scenario, it was not worth taking the risk for training. We moved indoors and they practiced flying it up/down stairwells and into rooms. They began to realize how powerful a tool it was - i.e., parking the drone on the floor at the end of a hallway keeping an eye out for bad guys to come out of rooms, eliminating the need to post a guy at the end of the hallway, etc.
By this time, it was late afternoon and I wanted them to experience night flight with their M2E. We went up on the mountain where I live and had previously alerted the residents that the SWAT team would be flying a drone and that aliens were not invading. I wanted them to fly to a water tower a half mile distant from the launch point and orbit it at night with the drone. Working up to the night flight, we first flew the mission at sunset, then again at nautical twilight. Finally we waited for it to get good and dark. So dark that you couldn't see the water tower from the launch point. They came up with the idea of using their rifle laser to put a point of light on the water tower a half mile mile away for the drone to hone in on. Worked like a charm. Once at the tower, they used the Spotlight on the M2E to turn night into day and orbit it. The residents in the house next to the water tower knew the training was going to occur and had invited all the neighbors to come watch and were on their back porch with all the neighbors "oohing" and "aahing". For that mission, I acted as a remote VO at the base of the water tower and was in contact with them via radio to ensure no problems. The second pilot acted as the VO back at the launch site.
Both pilots flew all the missions both indoors and outdoors. They intend to use their M2E for outdoor ops. After flying my Mavic Air indoors, they decided that's what they want for indoor ops. The chief pilot said he was going to save his money to buy one out of his own pocket; his office does not have access to the financial resources that a LE office would have in a big city. I've been trying to find a great deal on an MA for them (I paid $560 for my MA last Thanksgiving at Target on sale); if anyone knows of a great deal on a Mavic Air, clue me in - I want to help them.
Was a tiring day 9 hours straight, but a heck of a lot of fun. There was significant risk in everything we did - but the risk was understood, well managed and mitigated. No drones were damaged and no mishaps occurred other than me cutting my finger on a prop indoors with the Mavic Air (does that classify as a combat injury?

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They got a lot out of it and were deeply appreciative. I was extremely impressed with the SWAT team pilots. They kept a log of EVERY flight on their M2E - i.e., who flew, how long, doing what, any problems, etc. The care they took of their M2E drone was exceptional. Don't hesitate to ask them for input, it was their idea to use their rifle laser to paint the water tower so the drone had something to hone in on in the dark.
They said they obviously couldn't use me for tactical ops, but would give me a call for any SAR missions they had. My advice? Don't be afraid to push the envelope with them. Recognize risk and mitigate it. And have a lot of fun. It was one of the most rewarding and enjoyable things I've ever done with drones. The SWAT team was a great bunch of guys to work with - a good counterbalance to all the recent negative publicity that police get. Anything I can do to help them is worth my time.