Yeah... If you served or if you still do. Take advantage of it.
But for me, when I do need a quick oil change since I'm usually always on the road between service calls, I just go in and say right off oil change only, do not check anything else. I usually don't get harassed after that or they notice it's a company vehicle and know I could care less if I need an air filter! Their $30 air filter is the exact same one I get for $10 at crappy tire and or the auto supply store right behind the Mr. Lube I use in my case. But yes they can hard sell and do screw up sometimes. Years ago, went home after oil change and popped the hood to check something else. Sitting by the hood release area, they left their socket wrench sitting there!