first echelon maintenance

first echelon medical equipment maintenance

echelon-to-echelon communications system

first fire mixture / first-fire mixture

echelon maintenance

third echelon maintenance

second echelon maintenance

fifth echelon maintenance

contingency maintenance / special maintenance

depot maintenance (beyond O and I level activities, performed in an industrial-type facility) / D-level maintenance

maintenance checks / routine maintenance, scheduled tasks

maintenance idling (periodic running of engine for maintenance purposes)

organizational maintenance (O-level) (day-to-day work that standard airfield maintenance groups perform in support of airfield operations)

routine maintenance / scheduled tasks, maintenance checks

scheduled tasks / routine maintenance, maintenance checks

special maintenance / contingency maintenance

assault echelon

attacking echelon

brigades in echelon

echelon above corps (EAC)

echelon attack

echelon left / right formation

follow-on echelon

followup echelon

headquarters echelon

headquarters rear echelon net

higher echelon

logistics (supporting) echelon

rear echelon

reserve echelon

security echelon

tactical echelon

A1 echelon