With my first character (lvl 55), I went about skirmish soliders as just picking one for each occasion, not thinking that the costs of leveling would get so much higher, ending me up with 3 moderately good soliders, only one of them are useful for me to use. So my proposal is to have the option to completely reset all skills, (attributes, skills, training and personal) to their original level and get your marks back. Allowing you to start fresh instead of crippling yourself to a long grind to recover lost marks.

Lvl 55 hunter.