Huh, the B-29 development and the Manhattan Project, being unrelated however both prived to be a solid investment in the long run.
But again, the ratio of manpower committed versus casualties shows a higher percentage in the Pacific Theater than in continental Europe.
In other words, more men were sent to fight in the ETO/MTO than were sent to the PTO.
Of those numbers committed to the ETO/MTO, a lesser percentage were KIA/WIA than the number of men committed to the PTO.
There is also the issue of topography - the ETO/MTO was by and large, fought over a landmass. So casualties were inflicted over the course of aerial and land battles.
In the PTO, battles were fought over land, sea and air.
When a bomber is shot down, you lose a bomber and (roughly) 10 airmen.
When an aircraft carrier is sunk, you lose a carrier, several dozen (or more) aircraft and potentially up to 2,000 men.