Like most criminals the Deep State is not very creative.
They use the same method of operation over and over and over again...
With that in mind we can use the JFK assassination plot as a template.
For logistics the CIA was used—with on site supervision the responsibility of E. Howard Hunt—a veteran of foreign field operations.
He was responsible for any logistical support needed—vehicles, weapons, clothes, locations, maps etc etc etc.
This is the resume to look for—probably involved in secret overseas military and/or intelligence operations—including assassination—before joining the Secret Service. They probably were very experienced in communications, including possibly hacking or disrupting enemy communications.
Footnote: I looked at the Secret Service org chart.
None of those folks have the talent and experience necessary to be a “player” in an assassination plot imho.
The CIA and/or FBI probably had moles at lower levels of the organization in charge of on site assassination planning and execution.