From Halopedia, the Halo wiki
The EV-44 Nightingale is a dedicated support unit that uses its complement of multipurpose restoration drones to heal and repair personnel and vehicles. Its relatively simple construction (aside from the advanced drone system) has made it possible to adapt the Nightingale's modern design blueprint to UNSC Spirit of Fire's older factory models.
The Nightingale is completely unarmed. However, the craft is equipped with various countermeasures, including the ability to deploy both multi-spectrum smokescreens and disposable jammers capable of camouflaging all personnel and vehicles within the target area.
During the Carrow Conflict in September 2558, the Surakan Militia Volunteers used armed Nightingales against Hekabe's forces. In April 2559, Nightingales saw action on Installation 00 during the fight between the UNSC Spirit of Fire and the Banished.
Halo Wars 2
The Nightingale can be built by all UNSC leaders at the Airpad. In Blitz, the Nightingale costs 70 energy, while a Trooper Nightingale costs 90 energy. When the Trooper Nightingale is destroyed, infantry squads will spawn. Unlike Engineers, the Nightingale can heal up to three units at once due to its drones, but the healing rate is three times slower. The Nightingale is the best unit to heal troops, saving the player from having to use Healing Drones constantly. Another great benefit is that it can heal troops when they are mobile.
Pro and Cons
List of appearances