Weapons platoon and squad
I do not believe Army rifle platoons should have a TOE weapons squad as they currently do (or did in my day). I believe rifle platoon leaders would be better served if companies have a robust weapons platoon in order to task organize weapons squads of various configurations for attachment to rifle platoons according to METT-TC.
Sometimes the platoon needs more rockets than guns, sometimes more guns than rockets, sometimes a mortar and sometimes not, sometimes a mix of crew served weapons.
Squad leaders in the weapons platoon should be senior staff sergeants trained to advise a rifle platoon leader on the employment of any crew served weapon in the company. So although a particular staff sergeant may be the machine gun squad leader in garrison, for operations he should be able to take one of his gun teams, a rocket team, and a mortar team (or any mix required) and report to a rifle platoon leader as a weapons squad.
It would help matters if the weapons platoon leader was a warrant officer from the infantry NCO ranks; something similar to the USMC gunners but one per rifle company. The Army did something similar in Special Forces with the assistant ODA leaders; they're assistant team leaders for their career. The weapons platoon leader would be similar. This WO could also serve as a capable temporary rifle platoon leader for the duration of an operation should the LT become a casualty. A WO weapons specialist would give the rifle company additional capability and stability.
"Shoot for the epaulets, boys! Shoot for the epaulets!" - Daniel Morgan