As Salaam Alaykum Wa Rahmatullahi Wa Barakatuhu

Some Muslims incorrectly think that suicidal bombings during war is not suicide but an act of defensive war. They see it the same as fighting with guns or swords in a war. However, shooting in a war, one goes in with the intention NOT to die. Using oneself as a walking or flying bomb, one goes in with the intention of killing oneself (and the perceived enemy).

Hadith - Bukhari 2:445, Narrated Thabit bin Ad-Dahhak

The Prophet said, "Whoever intentionally swears falsely by a religion other than Islam, then he is what he has said, (e.g. if he says, 'If such thing is not true then I am a Jew,' he is really a Jew). And whoever commits suicide with piece of iron will be punished with the same piece of iron in the Hell Fire." Narrated Jundab the Prophet said, "A man was inflicted with wounds and he committed suicide, and so Allah said: My slave has caused death on himself hurriedly, so I forbid Paradise for him."

Allah Hafiz
Sister Fatima