Excerpt from Praetor Marcus Atius Balbus's "Almanac of the Skills Displayed by History's Most Prominent Military and Magical Leaders"

LAND

Footslogger – Provides bonus to infantry units.

Armored Warrior – Provides bonus to tank warfare.

Desert Rat – Provides bonus to desert warfare.

Accuracy – Provides bonus to artillery.

Mountaineer – Bonus to mountain warfare.

Urban Warrior – Bonus to urban warfare – either defense or attack.

Stout Defender – Bonus to garrison units.

Old Guard - Bonus to outdated/older equipment.

AIR

Tank Buster – Bonus to destroying armored units.

Theater Bombardier – Bonus to bombing enemy cities.

Campaign Bombardier - Bonus to bombing enemy troops / supply lines. 

Reconnoiter – Bonus to reconnaissance patrols.

SEA

Task Master – Can travel long distances without a friendly port-of-call.

Explorer - Bonus to conducting a long sea voyage wiith fewer than ten ships.

Raider – Bonus to disrupting enemy merchant shipping.

Coastal Support – Bonus to assisting amphibious landings.

Submariner – Bonus to submarine warfare.

Sub-Hunter – Bonus to defending against / hunting submarines.

Convoy – Bonus to defending transport / merchant shipping.

Elusive – Bonus to avoiding enemy fleets.

GENERAL

Liberator – Military victories win popular support.

Butcher – Brutalize enemy / occupied population to maintain order.

Idealist – Colonial troops operate under this commander regardless of racial/religious difference.

Charismatic – Bonus to troop morale.

Resolute – Higher casualty tolerance.

Logistics – No penalty if cut off from supply base – superior utilization of resources.

Methodical – Slower pace, but very thorough and fewer mistakes.

All-Weather - Resist to poor weather.

Experienced - Can be gained after considerable battle experience.

Theater Commander - Bonus to coordinating multiple army or naval or air groups.

Strategist - Bonus to operating a combined-arms force.  (Naval / Air / Land)

Tactician - Bonus to operating independently of command structure if cut-off from contact.

Technico - Improves repair time for damaged units aand limits destruction of mechanical units.

HEROES

Great Warrior – Individual's combat skill is so great that it provides combat bonus.

Sniper – Targets enemy officers to disrupt enemy advance / harms enemy morale.

Paladino – Holy Warrior whose battle skill and presence inspires others to greater acts of bravery.

Ranger – Warrior whose reconnaissance skills are unparalleled.

Centurion – Magi-Warrior who wields magic and melee on the battlefield.

ARCH-MAGI

War Magus – Magus who wields a balanced form of magic on the battlefield.

Necromancer – Magus who makes use of death and dark magicks.

Geomancer – Magus whose power is shaped by (and shapes) the immediate geography.

Druid – Magus whose power is derived from nature.

Oracle – Magus whose powers grant them the power to see great distances and uncover hidden truths.

Beastmaster – Magus whose powers are aimed towards the controlling of animals.

Loremaster – Magus who has a greater chance of discovering hidden magical items or secrets.

Healer - Magus who uses his magical skills to cure disease and injury.