Thank you for the opportunity to help you with your question!
The strength that is listed in Article 1, section 8 A states that the constitution gives congress its power to establish and maintain an army and a navy. If in case the US army falls they have the power to create the new army to protect US.
The weakness that is listed in Article 3, Section 1 B. It states that judges serve for life till they want to retire. This is one of the worst decision as the older person is not able to judge and observe the new world according to modern perspectives.
Please let me know if you need any clarification. I'm always happy to answer your questions.