It may be marketing, but believe it or not, this is standard practice for rockets! Here's the ULA Delta IV User Guide - https://www.ulalaunch.com/docs/default-

It may be marketing, but believe it or not, this is standard practice for rockets! Here's the ULA Delta IV User Guide - https://www.ulalaunch.com/docs/default-source/rockets/delta-iv-user%27s-guide.pdf https://www.ulalaunch.com/docs/default-source/rockets/delta-...