This modcomp changes the units Infantry, Marines and Mechanized Infantry so that they now display red cross symbols as soon as they get the Medic 2 promotion. For this to work, the entry for the Medic 2 is also altered, but this change does not affect other units in any way. There are also female versions for the Infantry and Marines included in the download.
There are no SDK or Python changes involved. The mod is mostly modular. All files in the zip-file are already put into the necessary folders, unzipping it directly in the Mods folder of BtS should result into a working mod. The only reason that this modcomp is not completely modular is that the CIV4PromotionInfos.xml file can not be made modular. However, only the LayerAnimationPath entry is changed and therefore merging of this mod should be quick and easy.
Forum link: http://forums.civfanatics.com/showthread.php?p=11934668
Medic Promotion Visualization 2016-10-05
Medic Promotion Visualization