"抢险救援任务" can be translated into English as "emergency rescue and relief mission" or "emergency rescue operation".
"Emergency rescue and relief mission" emphasizes both the rescue aspect (saving lives) and the relief aspect (providing aid and support) in emergency situations.
"Emergency rescue operation" focuses more specifically on the rescue actions taken during emergencies.
Both translations are appropriate depending on the context and the specific aspects of the task you want to highlight.