What prefix is used for MSC ships before their normal hull numbers?

The prefix used for Military Sealift Command (MSC) ships before their normal hull numbers is "T." This designation is important as it distinguishes these vessels from those of other naval services. The "T" stands for "Training" or "Tug," often indicating that the ship is engaged in logistical support, training, or non-combatant roles. This classification system helps in quickly identifying the type and purpose of the vessel within naval and maritime operations.

The other prefixes pertain to different categories of ships. For example, "R" is commonly associated with repair ships, while "S" might refer to ships that are part of a specific mission or vessel type. Each prefix is designed to convey essential information about the ship's operational status and mission profile, enabling efficient coordination and management within the naval force.