My dad was in bomb disposal in WWII...
(I colourised that from an old black & white picture that I restored for my mum after he died.)
Here is one of him with a comrade at the bottom of a hole which they had just dug down to a UXB.
I asked him why he volunteered for that. He said that he preferred the risk of sudden death to the risk of being badly injured or killed in combat.
After D-day he ended up being in the thick of it anyway - being shot at while trying to build temporary bridges, that kind of thing. One of his friends standing just a few feet from him was killed by a sniper.
I would not fancy bomb disposal either, but I'd be less scared of that than combat.