There are many fields of logistics. I do not want to mention all of them, nor go into detail in the following, but some that are worth knowing are:
Procurement logistics: "Activities such as market research, requirements planning, make-or-buy decisions, supplier management, ordering, and order controlling". Logistics (defined above) is the management of the flow of not only goods, but also non-physical things such as time, information, particles and energy. Procurement logistics is primarily of information.
Green logistics: "Describes all attempts to measure and minimize the ecological impact of logistics activities". If you wanted to use 5,000 old, not fuel-efficient trucks, each spewing noxious chemicals from their exhaust pipes then that certainly would not minimize the ecological impact of the activity.
RAM logistics: "combines both business logistics and military logistics since it is concerned with highly complicated technological systems for which Reliability, Availability and Maintainability [RAM] are essential".