We are not talking about mental issues or even curing diseases, any surgeon knows how to amputate or remove a bullet.
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Do they? I don't know of any surgeon where I work who has ever dealt with a gunshot wound or removed a round from the arm/leg/chest of a patient.
Those that have such skills have as retro righlty said had them honed as a result of working at Bastion etc.
For those who have removed them, how did they first do so? I'll tell you.
It would have been under the supervision and guidance of a senior colleague skilled in such procedures, just how every other surgeon learns to carry out a particular procedure. After that, they perform them as and when required and develop their skills and techniques, just as many Registrars/Senior House Officers will as a result of treating these Ukranian soldiers. They'll learn new techniques about skin grafting, stump shaping and saving vital tissue etc.
Subsequently, at some time in the future those skills and treatments will be utilised on our own troops, who hopefully will have better outcomes and prognoses as a result.
The one benefit from each conflict we are involved in is that medicine advances each time, regrettable though it is:
http://www.encyclopedia.com/doc/1G2-3401804460.html
From link:
During the Korean War, the helicopter was routinely used to evacuate casualties from the battlefield to near by mobile army surgical hospitals (MASH), where new lifesaving surgical techniques, such as arterial repair, saved many lives. These advances continued in military medicine during the Vietnam War with more sophisticated surgery and additional antibiotics and equipment. These developments contributed to just 2.5 percent of casualties dying from wounds received, the lowest number ever. During the Gulf War of 1990–1991, disease and nonbattle injury rates were markedly lower than expected.