If I understand correctly, “以身殉职” also means “因公死亡” in Chinese?
"die (be killed) in the line of duty"
“磨刀不误砍柴功”
sharpening the axe is for chopping more firewood.
Alternatives for 同归于尽：
"suicidal bombing" or "Operation kamikaze."
"Suicidal bombing" is taken from the recent events in the Middle East where do-and-die fighters dashed with exlposives at their objects.
"Operation kamikaze" is derived from a Japanese air-raid operation at Pearl Harbor during World War II when "kamikaze fighters" (神风敢死队员) crashed their fighter-bombers at the enemy fleet.