Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: SAS officers on a gruelling Special Forces selection march in which three soldiers died made a desperate plea for the exercise to be scrapped but were overruled by top brass, a coroner will be told. Just hours after reserve soldiers Lance Corporal Craig Roberts and Trooper Eddie Maher died on a 16-mile march in blistering heat on July 13, 2013, the SAS trainers were ordered to carry on with the marches over the Brecon Beacons. A third reservist, Corporal James Dunsby, also collapsed, and died in hospital a fortnight later. Army guidelines state that exercises must be stopped if troops suffer from heat-induced injuries, leading to claims that these rules were callously ignored.Reserve soldiers Lance Corporal Craig Roberts and Trooper Eddie Maher died on 16-mile march in blistering heat on July 13, 2013Just hours later SAS trainers were ordered to carry on with marches over Brecon BeaconsArmy guidelines state exercises must be stopped if troops suffer from heat-induced injuriesSenior officers from HQ of United Kingdom Special Forces will have to attend inquests into deaths, including that of Corporal James DunsbyThird reservist also collapsed, and died in hospital fortnight laterUp to ten officers, including doctors and medics, are facing negligence charges for their conduct on the tragic day. The charges carry maximum two-year jail sentences under military law;On the same day, ten elite full-time troops collapsed on another SAS exercise in the Welsh mountains. Some of the soldiers received fluid intravenously on the hillside;Special Forces chiefs made an attempt to hold the inquest into the controversial deaths in secret, insisting that any public discussions about SAS training posed a threat to national security;Defence sources have claimed that a police investigation into the deaths was bungled after detectives misread maps. Last night, Dyfed- Powys Police said the confusion had been corrected. 
 Question:These soldiers, many from elite Guards regiments and the Parachute Regiment, were hoping to gain entry into 22 _.

SAS