I think you missed the point. You wrote: "how could they ''hope'' a BLT would fit? they didn't know?". They did know, they didn't hope, when designed it could carry a fully equipped Battalion Landing Team and the means to get them ashore. Since then the amount of space and equipment for improved command and control, larger, heavier, additional, and new equipment have eroded their ability to carry all of it. "even if they couldn't carry a full BLT, the had a heavy punch..." and yes a MEU carries a lot of combat power.