Inside there is a two-bed intensive care unit, 12 low dependency ward beds, a two-bed emergency department and one surgical table available for use.
He said during the exercise they have been training with mock patients who have injuries that mimic battle-related trauma.
And with more than 40 real casualties so far, Lt Col Wilson said most of the health issues among troops are "non-battle related diseases" and "lower level stuff".
"The boys and girls are absolutely loving delivering care, and touch wood, fingers crossed, no one gets hurt and no one needs our support," he said.
"If we do nothing for three months that is a really good thing for the soldiers."
The field hospital is also where the Medical Emergency Response Team (Mert) bring those who have been out in the field on exercise and need further medical treatment.
With Puma and Chinook helicopters on hand, casualties can be taken to hospital by aircraft and also away from the area.
Squadron Leader Rob James is currently on his first Mert deployment as a doctor and works with the Devon Air Ambulance back in the UK.
"It is great to come out and actually do what I have been working towards for so long," he said.
Asked how important the exercise is to develop and maintain his Mert skills, Sqn Ldr James, said: "Operating in this environment with military kit and military aircraft is vital in preparing for anything else we might have to do in a non-exercise role.
"And I think from a wider defence point of view getting to operate in this environment with our Omani partners is equally valuable."