the NSC had a policymaking staff of 12 in 1962 when President Kennedy faced down the Soviet Union during the Cuban missile crisis. During the 2000s and the George W. Bush administration, the number of NSC staff members increased sharply to support the three-front conflict in Iraq, Afghanistan and the war on terrorism.
https://www.washingtontimes.com/news/2019/dec/31/robert-obrien-cuts-national-security-council-staff/
https://www.nationalreview.com/2019/08/book-review-white-house-warriors-national-security-council-role/
"The NSC oversteps and micromanages, there is too much distrust between the principals and within the NSC, and the commander-in-chief and his national-security adviser fail to assert themselves to settle disputes. This explains why Obama’s much-ballyhooed “team of rivals” approach to cabinet-building ended up being such a disaster."