Gray symbols are the proper motions of all sources that meet our filter criteria around the core Trumpler-14, 15, and 16 regions. The colored symbols represent the core dynamical groups as discussed in the text (see inset for key), after 2σ clipping. Overplotted are the proper motions of our candidate O-stars in Trumpler-14 (see Table 1). The two labels that overlap and are difficult to read are for the stars HD 93129B and Trumpler-14-9.