A kamikaze is a word for either the pilot or the plane used in suicide missions by the Japanese in World War II.
Any job in combat is difficult and could result in death, but one duty is considerably riskier than others: being a kamikaze. These Japanese pilots engaged in suicide missions: their goal was not only to harm the enemy, but they sacrificed their lives while doing so, crashing their planes. A kamikaze could be the pilot or the plane, and you can also speak of kamikaze missions. Today, the word is sometimes used for any situation that seems suicidal or risky.