This is about the current/maximum health/TU/morale bars in the ground combat main panel. Their current order is health (red), TU (green) and morale (blue), but I find this order unnatural and occassionally confusing. The problem is that they are not in the logical order of importance - the most important is definitely the TU one, as TUs are the most often used and checked, and they matter whenever a soldier does anything. But the TU bar is the middle one and so it is somewhat "hidden". It has already happened to me a number of times that I just quickly glanced at the bars and got the number of available TUs wrong. Moreover this is inconsistent with Geoscape, which lists them in TU/health/.../morale order in both Barracks and Soldier Equipment (and Barracks also calls TUs "APS", but that's a nitpick).
Therefore I think the bars should be ordered in the more natural order: TU, health, morale.