PS where's the link to the RUSI article you mention?
http://www.rusi.org/downloads/assets...elicopters.pdf
Note the use of the word 'future' in the title!
Most of this is much more appropriate to the NPAS thread than this one. However, there is some stuff about SAR in this document. Some of it is SAR viewed from a large quiet desk in a large noisy city but nevertheless some important questions are being posed.