Resident Troops and Ships. Gives the number of different kinds of troops living in the fief. Not all are available at all times. Some are traveling, some are too old to campaign anymore and some just don't want to get involved. So when recruiting or calling the local levy (self defense force automatically called out to resist invasion via pillage, raid, siege, etc.) you will only get a portion of these troops.
Knights- Knighted men at arms. Generally the most effective troops. Found in every fief.
MAA- Men at arms. Almost as good as knights. Mounted, trained and armored troops, usually professionals and/or mercenaries. Found in every fief.
Lt Cav- Lightly armed men at arms who operate primarily on horseback. Found only in areas that raise a lot of horses.
Yeomen- A uniquely English form of infantry. Armed with longbow and swords and usually mounted (if horses can be found). Fight on foot. Only found in certain parts of England and Wales.
Foot- Lower grade men at arms whose primary weapon sometimes includes the short bow. Some training and experience and a cut above the rabble. Many of these became mercenaries in the course of the Hundred Years War and many became Men at Arms and a few even achieved knighthood.
Rabble- Basically every able bodied man in the fief armed with whatever weapons they can scrounge (often just agricultural implements, but many knives, axes, short bows, homemade spears and even some professional arms and armor (usually what was scrounged from dead bodies of a previous battle in the area and kept rather than sold). Only used for self-defense of the fief.