SWAT operations, especially raids, require officers on the move with "locked and loaded" weapons. The risk of "friendly fire" is dramatically reduced through strict adherence to firearms safety rules. Moving with weapons in hand (on foot and in vehicles), in the heat of the moment, is an especially vulnerable time for accidents. Always remember, NO fingers on triggers unless you're intending to shoot right now.
All those officer down/medevac drills we do are paying off and saving officers' lives. The Austin Police Chief credits such training for saving the life of the detective wounded in a recent drug raid. Per the chief, "The officers did what they were trained to do. One officer pulled the detective to safety, while another officer provided cover fire." Officer down/medevac drill training needs to be Standard Operating Procedure.
SWAT docs and TEMS are proven life savers, and becoming the gold standard for on-scene emergency medical care in SWAT missions. This is evidenced by the two SWAT docs who recently saved the above-mentioned Dallas SWAT lieutenant's life, and who treated four wounded Dallas SWAT officers during a February 2006 drug raid. These SWAT docs were in the right place, at the right time, because someone decided that's where they needed to be.
The above incidents involved respected, experienced, highly trained agencies and officers. If it could happen to them it could happen to any of us, at any time. Always remember, there's no such thing as "routine."
Most of us can readily cite personal experiences of tragedies and near misses. The real question is whether we learn from them, because there will always be a "next time."