With the promised retirement of the dozen low-mileage Mark VI patrol boats by the Navy, it should be noted that service is not totally absent of small boats, still having the 33-foot SOC-R riverine boats of SBT-22 and the assorted 82-foot Mark V boats in the SWCC teams.
Then there are other, more numerous, assets in the Maritime Expeditionary Security Force.
Via a good article at Sea Power:
In addition to the Mark VI PBs, the MESF operates 164 patrol craft. These include 117 SeaArk 34-foot Dauntless-class patrol boats and 17 SAFE Boats 25-foot Oswald-class patrol boats. The riverine assault craft, riverine command boats, and riverine patrol boats all have been retired and stored. The single Coastal Command Boat, a smaller predecessor to the Mark VI that was deployed to the 5th Fleet, was transferred to a test role in 2018.
Further, the Oswalds are being replaced by a series of 120 40-foot PB(X) boats over the next 10 years to replace the 34-foot and 25-foot PBs.
The Navy also has ordered 24 Force Protection-Medium (FP-M) patrol boats from Lake Assault Boats LLC, which was awarded a contract for up to 119 FP-Ms in February 2020. The 33-foot-long aluminum V-hull boats will be used for harbor and waterway patrols, interrogation of other waterborne assets, and escorting large vessels in and out of ports in various weather and water conditions. The first was scheduled for delivery this spring.