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Class G airspace — surface up to but not including 1,200 feet AGL; Class E airspace — 1,200 feet AGL up to but not including 18,000 feet MSL.

As shown in the attached figure, Bryn Airport (a private airport) is located within a Military Operating Area and near a Restricted Area (see the larger figure from the question). The absence of other airspace markings indicates that Bryn is surrounded by Class G airspace, which is common for many private airports. Additionally, we know that in the US, Class E airspace begins at 1,200 feet AGL (not depicted). Therefore, in this case, the airspace is Class G from the surface to 1,199 feet AGL and then Class E from 1,200 feet AGL up to the next underlying airspace, Class A, at 18,000 feet MSL. For more details, refer to the “Class E: Definitions” and “Class G” videos.

Class G airspace from the surface up to but not including 700 feet AGL.

As shown in the attached figure, Barnes County Airport (BAC) is enclosed by a shaded magenta area, indicating Class E airspace starting at 700 feet AGL. This means the airspace is Class G from the surface up to 699 feet AGL, and Class E from 700 feet AGL up to the next underlying airspace, Class A, which begins at 18,000 feet MSL. For more details, refer to the “Class E: Definitions” video.

Class D airspace to 3,200 feet MSL.

Fort Worth Meacham (FTW) is enclosed by a dashed blue line, indicating Class D airspace. The number “32” shows that this airspace extends from the surface up to 3,200 feet MSL, as depicted in the figure below. For more details, refer to the “Class D: Skyvector” video.