LTC and COL are cool sounding ranks but is this really a way people will reduce burnout? they don't actually serve much function and basically just allow you to cover up a boring job with promotions which are one of the few truly satisfying parts of the server. There has to be better ways to keep people interested than simple linear promotions.
This feels like a plaster solution to a real problem of player retention.
There was a time in synergy when ranks would take months and months to get through and it was a genuine slog but there was actually very few complaints about how slow the system was because there were great events and a really fun community to partake in. Getting to BCMD in a year was considered quite fast in large battalions in early synergy because ranks were an incredibly strong status symbol rather than just an incentive to keep playing like mobile games having daily rewards.
Keeping people interested in the server is harder than just adding ranks and this would just bloat battalion's officer corps which are usually already huge. Maybe slow down sergeant progression and make officer a longer process to obtain while increasing power and responsibility of NCOs. Make being a sergeant something to actually enjoy rather than being a work horse step to officer where you actually get power and say. SGM is essentially exactly the same as SGT more or the same amount of steps as WO to CMD yet the difference in power gain is enormous in the officers but non existent in Sergeants.
There are smarter ways to approach burn out than adding buffer ranks in-between commander and major, in fact for a lot of early synergy the Colonel ranks didn't exist at all.