That.. is a tent.
https://www.dvidshub.net/image/6787138/348th-field-hospital-...
In a conventional conflict mobilizing entire divisions, as the US is now preparing for again, you will see far more capable field hospitals again, because the US won't have the necessary capacity (either in terms of airlift volume nor existing hospital beds) to afford this luxury.
Which is kinda weird, even in retail, u can get 3m x 8m tents (or so) that could be carried in a helicopter.