The military has many specialized needs. Their clothing needs to maintain a quality that will last them through some harsh conditions. The dress uniforms need to be outstanding when they need to put them on. That is why there needs to be quality military sewing contractors available to handle such demands. People in combat do not always have the chance to replace uniforms when they start falling apart. The uniforms of the men and women who serve have to be ready for extremes most people never see.
People do not know where their military personnel will be sent. One day there could be a tsunami in a nation that has sweltering. Another day could have people dealing with mountainous areas that have over a foot of snow around them. Military sewing contractors have to make sure that the products they provide can be beat up daily and stay together through it all. Clothes meant to keep people warm should not fail because the stitching unraveled. People guarding leaders should not have to buy new dress uniforms every few months.
If uniform issues become noticeable, suppliers will change. This can mean massive layoffs or plant closures. That is why military sewing contractors know they have to get the work done right or the contract will go away. This is why they make sure they understand the needed level of quality. No contractor wants to be known for letting down those who serve the nation with bad work.