Personal Mounts-
Each trooper in the squad is issued a personal mount, either organic or mechanical in nature.  Organic mounts can be horses, giant birds, sea creatures, or the like. Flying creatures are excluded from this due to things like saddles and such interfering with the ability of the creatures to fly.  Mechanical mounts can be motorcycles, hover bikes, ski-doos, and the like.  Again, actual flight type vehicles are excluded since this is covered under separate equipment…and no politician cares to spend that much money just to equip some uneducated grunt.   Both types of mounts are listed below with their advantages and disadvantages.

    Organic Mount   
    MP x3       
    Thermal Signature +1        
    Terrain Limitations: Ocean/ Deep water or Any Land   
    EM Cost: 1   
    Offensive Modifier: +1

    Mechanical Mount   
    MP x5   
    Thermal Signature +2        
    Terrain Limitations: Ocean/ Deep water, Heavy Forest, River, and Any Swamp or Any Land       
    EM Cost: 2   
    Offensive Modifier: +2

Basically: The Terrain limitations are what the mount can access. So if an Organic Mount is aquatic it is obviously limited to aquatic terrain. Or a horse...is limited to any Land. Why not swamp too? While it is possible to traverse a swamp on a horse...it is far FAR more trouble than it is worth...and is faster on foot or by boat. (I grew up riding before I could actually walk so have a bit of first hand experience on this one.) Hope that helps.