Interesting that Johnson's mentality seems to be rather different than OTL; there seems to be greater conviction in the worth of the war in SE Asia, and that the strategy won't be based entirely around retaining the ability to withdraw. Stuart Symington, at least from the tidbits I've seen, would also seem to favor a more 'sharp blow' approach to demonstrate strength, as opposed to McNamara style gradual escalation designed to demonstrate limitations.
Pres. may be having some choice disagreements with his staff/cabinet on the Laos issue - Symington and Fulbright were not exactly on board, here.