Psychiatric and substance abuse hospitals employed only 3,210 security guards, according to the BLS, less than 8 percent of all hospital guards. However, they were the best paid in the industry, earning an average of $35,000, or $16.83 an hour.
So the basic differences between Cavalry, Artillery and Infantry are as follows. 1  Infantry: Infantry refers to the soldiers on foot. 2  Cavalry: It generally means mounted soldiers. 3  Artillery: It uses large and long ranged weapons.
Answer Wiki. A spear is a versatile weapon, able to be used on foot and mounted on a horse. It is quite flexible in its range it offers. More importantly, in the hands of a good arm, it can be used as a projectile- something similar to a javelin. A lance on the other hand is often a one-time use.