DEPARTMENT OF THE NAVY
OFFICE OF THE CHIEF OF NAVAL OPERATIONS
2000
NAVY PENTAGON
W
ASHINGTON, DC 20350-2000
OPNAVINST 3501.177B
N42
13 Feb 2015
OPNAV INSTRUCTION 3501.177B
Subj: REQUIRED OPERATIONAL CAPABILITIES AND PROJECTED
OPERATIONAL ENVIRONMENT FOR POWHATAN (T-ATF 166)
CLASS FLEET OCEAN TUG
Ref: (a) OPNAVINST C3501.2K
(b) NTRP 1-03.5
Encl: (1) Projected Operational Environment (POE) for
POWHATAN (T-ATF 166) Class Fleet Ocean Tug
(2) Required Operational Capabilities (ROC) for
POWHATAN (T-ATF 166) Class Fleet Ocean Tug
1. Purpose. To issue the required operational capabilities
(ROC) and the projected operational environment (POE) for the
POWHATAN (T-ATF 166) Class Fleet Ocean Tug. This instruction is
a complete revision and should be reviewed in its entirety.
Significant changes include incorporating Electronic Warfare
(EW), Force Health Protection (FHP) and Information Operations
(IO) as separate mission areas.
2. Cancellation. OPNAVINST 3501.177A.
3. Discussion. Enclosures (1) and (2) provide the necessary
details to describe the mission areas and operational
capabilities for which the POWHATAN Class Fleet Ocean Tug was
designed and organized as required by reference (a). This
instruction provides resourcing agencies with the information
they need concerning T-ATF 166 Class mission requirements,
capabilities, and the types and locations of expected operations.
Enclosure (2) should be utilized in determining ROC within each
primary and secondary mission area. Primary mission area
readiness ratings (M-Ratings) should be reported utilizing the
Defense Readiness Reporting System-Navy (DRRS-N) per reference
(b).
4. Action. Fleet commanders shall periodically review
enclosures (1) and (2) and submit changes to the Director,
Strategic Mobility and Combat Logistics (Attn: N42) when
