If the event comments do not contain sufficient information (depending on what you have cad/RecommendUnit/RecUnitLogFlag set to) then your next best bet is to look in the RECOM_HIST table in the database.
But, even if unit recommendations are available into event comments, it's hard to quickly find the information because there is a lot of system remarks
the alarm level is not part of comments so if chief asked over the air "Dispatcher, give me which units were dispatched at alarm level 1 and which units were at level 2", our dispatcher can't answer quickly on correctly.
But, maybe I'm wrong. We are new to Hexagon cad so... :)