I was trawling through some ancient Military Modelling magazines from 1971 (which is what we did before t'internet) when I'm came across articles on RFC squadron markings, one of which dealt with 148 Aero Sqn.

Pilots of the 148th Aero Squadron, Gengault Aerodrome, Toul, France.
This all American squadron was British trained, most of the pilots having previously served in other RFC Sqns, and assigned to several months of training with British Squadrons.
Attached to 10th Brigade RAF at the beginning of July 1918 & remaining with the RAF until 28th October they were equipped with Sopwith Camels throughout the period.
The Sqn marking was a white equilateral triangle painted on the fuselage sides. Individual markings were large white letters painted forward of the roundel. I was thinking this might be a quick and easy repaint option for our American cousins to get some US Camel action going.


148th at Petite Sythe, France preparing for ops, 08/06/1918

The O.C flew A,
'A' flight had B,C,D,E,F,G; Flight Cmdr Lt Oliver flew B
'B' flight had H,K,K,L,M,N; Flight Cmdr Lt Springs flew N
'C' flight had O,P,Q,R,S,T; Flight Cmdr Lt Clay flew S

During the sqns 99 days in action a total of 62 Camels were issued...
8 were shot down
23 were crashed due to pilot error or battle damage
3 returned as too old for combat (getting to know that feeling..)
11 returned to depot for various mechanical reasons
17 handed back to the RAF

Not anything near a comprehensive history but good enough for the markings.