The Allies undertook numerous raids that often were quite dangerous, but never ones that could only be described as suicide missions for those participating, certainly not on such a high scale. Only the HMS Campbeltown raid on St. Nazaire comes close where some 60% of the forces committed were killed or captured. There was however a credible escape plan and the target was at the extreme edge of the German sphere of operations, not deep into enemy held territory. The best the paratroopers could hope for is for a small number, less than 5% might ex-filtrate to Switzerland or Spain. Looking at a Bomber raid however would not constitute a suicide operation. Those who made it back and did not would be the luck of the draw and every pilot/gunner would have their extraction plan/route under their feet. I'm sure the hope, if not the plan called for lower casualties, but the friction of war rared it ugly head and bollixed the best laud plans.