Final answer:
The question about 'FMS for E4-E6' is unclear without additional context, as the acronyms could refer to various systems or levels in different fields.
Step-by-step explanation:
It appears there is a misunderstanding or a typo in your question regarding the 'FMS for E4-E6'. This acronym can have different meanings in various contexts and without additional information, it is challenging to provide a specific answer. For instance, 'FMS' could refer to 'Fleet Management System', 'Financial Management Service', 'Flight Management System', or 'Functional Movement Screen' among other things, depending on the industry. Similarly, 'E4-E6' could represent different levels or categories depending on the context, from military rankings to levels in an educational or professional certification program.
If you can provide more context or clarify the question, I may be able to offer a more precise answer. Please consider the possible areas like military rankings, technology systems, or other fields where such acronyms are used to give a better direction.