TFOCA stands for Tactical Fiber Optic Cable Assembly. Unlike normal fiber optics, these are made for high strength, as they're meant to be used in harsh environments. TFOCA is used in aerospace, oil-drilling, military, and water purification applications.
TFOCA connectors are generally hermaphroditic, so any two can be connected, regardless of gender. Several US Department of Defense specifications and military specifications apply to TFOCA, including DOD-1678, MIL-C-83526/12-01, and MIL-STD-810C. Normal (civilian) fiber optic connectors are much less expensive, but require a variety of specialized tools to assemble.
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References
TFOCA Wikipedia(Text) CC BY-SA