All military personnel on board are safe, but the incident raises the risk of the mission in full hostile territory.
Attack during the rescue operation
The incident occurred while U.S. helicopters were participating in the search for the pilots of the F-15 shot down in Iran.
According to sources cited by NBC, the aircraft were hit by Iranian fire during the mission.
Despite the impact, no casualties have been reported among U.S. personnel. 
A mission in extreme conditions
The rescue operation remains active in an environment of maximum tension.
The aircraft involved fly at low altitude and at reduced speed, which increases their exposure to attacks from the ground.
The objective is to locate the second missing crew member before Iranian or civilian forces can find him.
The context: a fighter jet shot down in Iran
The attack on the helicopters takes place after the downing of a U.S. F-15E in Iranian territory.
One of the two crew members has already been rescued.
The second remains missing, which keeps a high-risk operation ongoing in the middle of a combat zone.
Real-time escalation
The impact on rescue helicopters introduces a new level of tension.
It's not just about a search operation.
It is an active confrontation in which even rescue missions come under fire.