Alas, Uncle Sams Confused Group doesn't get it's due in the world of decals.
Micro-Scale used to have a sheet in 1/72 for the Monogram Albatross, the Aurora H3, and the HC130 from Heller, but they quit making it years ago. Even when produced several of the air stations on it were no longer around. . .
A company in Austrailia was supposed to make a sheet for an HH60J, as listed in FSM over a year ago, but it was never produced.
I'm afraid your only choices are the 1/72 Revell (ex Matchbox) kit of the HH65A, or the Trumpeter kit of the same aircraft in 1/48. Revell also has some old CG shields in it's rebox of the H19 kit, again in 1/72.
I'm afraid even if every modeler of USCG kits stood up and demanded a decal sheet, the companies would ignore us. . .all ten of us.
Don
I know it's only rock and roll, but I like it.