I think the closest to what you're looking for is FM 3-96 the Brigade Combat Team (https://armypubs.army.mil/epubs/DR_pubs/DR_a/ARN31505-FM_3-9...). The is the smallest unit that includes effectively everything the Army can bring to bear, including infantry, armor, artillery, and rotary aviation. There might still be some fairly specialized intelligence, surveillance, and recon assets only available to divisions, but most of what the Army can deploy for fighting purposes exists in the BCTs at this point. I imagine other branches of service have their equivalents in terms of doctrine on how to employ submarines and fighter jets, but I only ever served in the Army and am most familiar with their tactics and doctrine.
I think the closest to what you're looking for is FM 3-96 the Brigade Combat Team (https://armypubs.army.mil/epubs/DR_pubs/DR_a/ARN31505-FM_3-9...). The is the smallest unit that includes effectively everything the Army can bring to bear, including infantry, armor, artillery, and rotary aviation. There might still be some fairly specialized intelligence, surveillance, and recon assets only available to divisions, but most of what the Army can deploy for fighting purposes exists in the BCTs at this point. I imagine other branches of service have their equivalents in terms of doctrine on how to employ submarines and fighter jets, but I only ever served in the Army and am most familiar with their tactics and doctrine.