Compañía meant, as one could guess, a "company," in a military sense. Dotación has more than one meaning, but here it would mean, more or less, a "patrol." The Compañía was made up of Chamorros and would have dressed, more or less, like the Filipino soldiers above. Sometimes Chamorro guards watched over the presidiarios, or exiled convicts, some Filipino, some Spaniards, when Guam was used as a penal colony by Spain.
The Compañía was not always the most loyal or dependable! In 1884, some members of the Compañía ambushed and killed the Spanish Governor, Angel Pazos Hidalgo, right at the Palåsyo (Palace) in Hagåtña! The Chamorro ring leaders were eventually tried and executed.