Like civilans, at the time of need, aremd forces like miliatry also feel the requirement of tents that can be met by these temporary structures. Even disaster relief operations demand a place of refuge for the displaced that can be easily taken care by such structures.
In many of these instances, permanent buildings, even if available, might not be required due to the temporary nature of these events. Hence Military Tents which can be installed within a day or so are a good and effective alternative to permanent buildings.
What clear span means to our venue is that there are not any pillars of the structure. This gives us the maximum utility of the space available. In events where guests are expected to be seated, no pillars would indicate a simple flow and clear sightlines everywhere within the structure particularly if there's a presentation going on.
These structures that we are writing about would not be such an effective alternative if they were not designed to withstand the requirements of being outdoors. The ability to withstand heavy winds and rain is important in this type of temporary structure.
More often than not, organizers of events require a venue only for the duration of the event. It wouldn't be a good financial decision to rent out a permanent building without knowing about Temporary Structures.