I photographed these variants of the Bell Model 47 Sioux helicopter family on display at Pima, McMinnville, Yanks/Chino and the NMoUSAF. The naming system of the Bell Model 47 is pretty complicated as it was used by different branches of the military and changed dramatically through its development. Here is a website that explains the differences in the Bell Model 47 family of helicopters.
OH-13E Sioux 51-14175
The military version of the Model 47 D-1
Yanks Air Museum, Chino 2018
OH-13G Sioux 52-7819
Olympic Flight Museum 2016
Olympic Flight Museum 2018
Olympic Flight Museum 2019
Olympia 2022
Olympic Flight Museum 2023
OH-13E Sioux 5113934
Military version of the Model 47 D-1
Evergreen Aviation Museum 2015
Evergreen Museum 2018
HTL-2 Sioux 122952
Pima Air Museum 2017
This is the Navy version of the H-13B (Model 47 D)
HTL-7 Sioux 145842
Pima Air Museum 2017
This is the Navy version of the Model 47 K
UH-13J 57-2728
Special USAF version of the Model 47 J Ranger for use by US Presidents Dwight D. Eisenhower and John F. Kennedy. Only two were built.
NMoUSAF 2018
Bell 47G-3B-1 #6664
Missoula, Mont. 2022
Bell 47D
unidentified aircraft in MASH markings