The operation was a system
Operation Market Time is best understood as a coordinated coastal surveillance effort, not a single kind of patrol. Different platforms occupied different roles and distances. The operation-wide framework supplies context, while the ship-specific record must carry the claim about Phoebe itself.
A ship presence needs a source
The July 1966 highlights provide a contemporary operational reference for Phoebe among Market Time forces. That is stronger than an undated caption, but it still does not prove every movement or action later associated with the ship.
Read the page beside the study
The official study explains organization, phases and the underlying source trail. Placing it beside the contemporary highlights lets a reader move between the operation as a system and the ship as one documented participant.