Going by your definition, living on earth is a suicide mission because as we all know every human…
Chidi Nnanna

Suicide missions do not always end in death but they are called suicide missions because of the very high chance of death being the outcome. Consciously embarking on such a mission is suicidal.

Indeed, soldiers can suicidal. They (believe that they) are fighting for a cause but it is still suicidal to carry out operations with a high risk of death.