The Hospital, one of the most important structures for providing healing to all the unit types, and having some secret powerful units deep within.
The Hospital allows the production of Meditecs, a very powerful ground unit that can heal and repair wounded Infantry and Armored Vehicles. You can also summon a Rescue Team, which consists of three meditecs for 20 Influence.
The heals provided by Meditecs are outstanding, even just four of them can make Chronite Tanks very hard to deal with. And as they stack up with stronger units, it can create a near impenetrable wall that only Shrikes can help with.
The Hospital has a future upgrade that not only provides some of the strongest Influence units, but faster Manpower generation and Angels for air unit support. It is a very important structure to have, and even has its place for Forge players.