acevedo is on dhs advisory board.
https://www.dhs.gov/homeland-security-advisory-council-members
dhs pays for drills sometimes reported as news, they practice dealing with media.
no telling how many in pipeline when potus took office. they have a prep term of 2-4 years on full scale events. MOUs do not allow cancellation.
here is an hseep that came up with his search he was also board while travis county sheriff (austin.) will give you a general idea.
2013
https://www.fema.gov/media-library-data/20130726-1914-25045-8890/hseep_apr13_.pdf
they do the staged full scale events thru partnerships with the COGs council of govts and agencies participating get grant funding (just like parkland did.) ebola was another big one in dallas that went nationwide.
tons of slush funds attached to these things, tons!
here is the houston cog
https://www.h-gac.com/
after sandy hook all the details started going behind password firewalls
not sayin this is a staged drill but pretty sure acevedo not ((ours))