The punishments, which have not been publicly announced, are largely administrative. But in some cases the actions, such as letters of reprimand, are tough enough to effectively end chances for further promotion. The military has previously said some personnel were suspended from their duties but has given no further details.
The disciplined include both officers and enlisted personnel, but officials said none are generals.
The officials, who were not authorized to discuss the outcomes publicly and so spoke on condition of anonymity, said the disciplinary process is nearly complete. It is derived from a military investigation of the Oct. 3, 2015, attack, the results of which are expected to be made public in a partially redacted form in coming days.