In the 15 years I've been with Ole97, I can only remember 4 serious ones.
One time we had a boy go down to Camp Tallaha with the troop, was running and fooling around in the mess hall (instead of camping in the cabins or tents they were sleeping in the mess hall? and fell and broke his arm (right angle break!) - 2 ASMs took him to the Hospital, medical form in hand. Keep those medicals and perm slips handy.
When a subset of the troop was headed to Philmont, one kid who was an absolutely out-of-control discipline problem who would NEVER do what you told him, went climbing up a cliff in OK City at a rest stop. Leaders told all the boys NOT to climb. Yelled at him to come down immediately. Well, he was still climbing up when he inadvertently obeyed.

35 foot fall, femur broken in two places, airlifted out, missed Philmont, ended up with a Steel rod in his leg. Never had another issue with him.
50 miler canoe trip in AR, one bright Eagle Scout decided to shinny up a 2' diameter tree hanging over the river to put a rope out so the rest could swing and drop in the river. The tree was literally COVERED in poison ivy. He was wearing nothing but a pair of shorts. I told him not to, but he did it anyway, said he wasn't allergic. Came down covered in sap, washed in the river with soap and water. Finished the 50-miler with oozing welts ALL over his body. Spent the rest of camp lying down drugged up on Calamine, Benadryl, and I don't know what else the camp nurse shot him with but I suspect it had brains in it, cuz he got smarter and started listening.
1996 - Troop headed back from Cumberland Caverns on I-40. A car coming the other way lost the left front wheel, which rolled into the median and became airborne. bus driver Doug Mangum swerved to the shoulder so the tire wouldn't hit him (cars in the lane to the right) - The tire came through the front passenger side windshield and sheared off a metal fan cooling the driver. Tire hit the stairwell wall, down into the stairwell, bounced up and dented the roof, and ended up in the front passenger seat (empty, I had to work that weekend or I would have been in it). The metal pieces of the fan flew back through the bus and embedded in the ONLY other seat empty in the very rear of the bus. windshield glass flew back through the bus also, peppering the boys with minor cuts on face and hands.
Doug hit the brakes and slowed the bus to a stop. If he'd swerved right they probably would have impacted cars on the right, bounced back, and killed the driver with the tire. If he'd swerved left too fast the bus would have rolled. No seat belts - the bus was old. They found the grill to the fan stuck in a pack in the back of the bus. The fan blades were sticking out of that only empty seat, blade first. We retired that bus this past year, but the old 'Swamp Fox' still had that slit in that back seat up until the bus died for the last time, a 'fingerprint' of the angels watching out for the guys. Out of all that, the only injuries were minor cuts on the faces and hands of some of the kids. No glass in the eyes.
...and VERY glad I wasn't along.