Just to point out for those who may not know.

DoD Instruction 1334.1, “Wearing of the Uniform,”

1.2. POLICY.
a. The wearing of the uniform by Service members of Active and Reserve Components, retired Service members, cadets, midshipmen, auxiliary members, and members of organizations authorized to wear a military uniform by the respective service, is prohibited under any of the following circumstances:

(2) During or in connection with furthering political activities, private employment, or commercial interests, when an inference of official sponsorship by DoD or the Military Service concerned for the activity or interest may be drawn.

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Now, the Marines in attendance at that political activity were almost assuredly under direct orders to attend that ‘speech’, but that doesn’t excuse them, or their commanders, from what they did (for they should know better), nor the politicians who abused the public trust, and the non-politization of the military, by inferring that the military would, or will ‘back up’ Biden’s rant by having them on stage. The only time uniformed military service members are permitted to attend a political activity is  as a member of a joint Armed Forces color guard at the opening ceremonies of the national conventions of the Republican, Democratic, or other political parties
(DOD Directive 1344.10 -§ 4.1.2.15)

What Biden and his handlers have done is make a direct threat to his political opposition by showing that he feels he has the power to use the military for partisan political purposes.

Banana Republic, we have arrived.