Depth Charges and Other Photos | Bob Duffy Collection

Bob Duffy submitted a number of scans of photos obtained in an antiques shop in Long Island back in the 1970s.

Does anyone have input on the fourth photo? Not a chaser. A patrol boat of some kind?

Also note the nice shot of depth charges racked on a barge of some type. Can anyone identify the vessel?

Photo Set - click to view large versions: 
Deck gun on a chaser. | Bob Duffy Collection
Deck gun on a chaser. | Bob Duffy Collection
Manning the deck gun. | Bob Duffy Collection
Not sure what we're seeing here ...  | Bob Duffy Collection
On a chaser. | Bob Duffy Collection
Caption: "Fueling from Hippopotamus or Chestnut Hill" | Bob Duffy Collection
Crewman on a chaser. | Bob Duffy Collection
Depth charges on a barge of some sort. | Bob Duffy Collection