A 27-year-old military servant was delivered to the regimental aid post 1,5 hour after getting an abdominal injury with an aerial bomb splinter. Objectively: the patient is in grave condition, pale, Ps-132/min, AP- 80/60 mm Hg. Subcostal area has a bandage on from the first-aid pack, the bandage is soaked with blood. The abdomen is tense. Percussion revealed dullness in flat parts that changes its location with the change of body position. There are symptoms of peritoneal irritation. What department of the regimental aid post should provide medical care?