One perhaps should ask how this decision reached CAS (if it even has)? I'd imagine that everyone from Sqn Cdr, Stn Cdr, Force Cdr and AOC Gp has probably wrung their hands of it - leaving CAS as the 'last resort'. Put yourself in his shoes; if the Truckie 'expert' DH chain has refused to authorise it why should a non-expert SH pilot agree to it? The DH chain is built upon using SQEP in key positions - if they've said 'too much risk' then why should he overrule his 'experts'?