Introduction
A final rule from the Department of Homeland Security, effective August 11, 2026, codifies new nonimmigrant visa classifications for foreign maritime workers engaged in lightering, the ship-to-ship transfer of liquid cargo such as crude oil or natural gas. The rule creates two new designations, C-4 and D-3, for lightering crewmembers, and extends their authorized period of stay from 29 days to up to 180 days. It brings federal regulations into alignment with the Energy Security and Lightering Independence Act of 2022 (ESLIA), which Congress passed to give the industry a clear legal pathway after years of relying on discretionary immigration measures to keep its workforce operational.
Background
Before Congress enacted ESLIA, foreign crewmembers performing lightering operations in U.S. waters sat in an awkward position in the immigration system. The two available pathways, admission as a C-1 transit nonimmigrant and temporary landing privileges as a D crewmember, both capped authorized stays at 29 days. Lightering contracts routinely run well beyond that window, and lightering vessels typically operate between other vessels offshore without making foreign port calls, so workers couldn’t easily satisfy the departure-and-return cycle that traditional crewmember classifications assumed.
Faced with this mismatch, U.S. Customs and Border Protection used its discretionary parole authority to admit lightering crewmembers case by case for up to 180 days. CBP estimates this practice covered roughly 6,500 alien crewmembers paroled annually across all duty types, though parole data doesn’t break out how many of those were specifically engaged in lightering. ESLIA, enacted in January 2023, amended the Immigration and Nationality Act to add new subclasses under the C transit and D crewmember classifications tailored to lightering operations, eliminating the need for discretionary parole as the default mechanism.
What Is Changing
The final rule amends two parts of Title 8 of the Code of Federal Regulations, Parts 214 and 252, to give effect to what ESLIA already mandated at the statutory level. The main change is the formal creation of the C-4 nonimmigrant designation for lightering crewmembers who are transiting the United States to join or depart a vessel on which they will perform, or have performed, ship-to-ship liquid cargo transfer operations to or from another vessel engaged in foreign trade. Separately, the D-3 designation covers crewmembers who seek temporary landing privileges while actively performing those same operations and who intend to depart on their vessel of arrival or on another vessel or aircraft within the authorized period.
Both classifications carry a maximum authorized period of 180 days, a big jump from the prior 29-day ceiling. ESLIA and the implementing rule also clarify that performing ship-to-ship liquid cargo transfer operations does not count as services, work, labor, or employment in the United States for immigration purposes. That clarification is written into the amended regulatory language and relieves lightering crewmembers and their operators from employment-related compliance concerns that could otherwise complicate the classification.
The rule also makes several technical corrections: updating cross-references within 8 CFR 252.1 and 252.2 that had become inaccurate, and reassigning the C-3 designation from INA section 101(a)(15)(C)(iii) to its correct statutory citation at section 212(d)(8). D-3 crewmembers are also exempted from the standard requirement to seek CBP permission before departing by means other than their vessel of arrival, an adjustment that reflects how operationally flexible lightering assignments tend to be.
Who Is Affected
The workers most directly affected are foreign nationals serving as crew on vessels performing ship-to-ship liquid cargo transfers in U.S. waters, particularly those handling crude oil, petroleum products, and liquefied natural gas. These individuals, who previously entered under discretionary parole or faced uncertain status if operations ran past 29 days, now have a defined, predictable nonimmigrant classification to pursue.
Maritime operators, shipping companies, and energy sector employers who rely on international lightering crews are also directly affected. The new classifications give those employers a stable framework for crew planning and documentation, replacing the ad hoc parole process with a codified pathway that CBP will apply consistently. Non-lightering crewmembers are explicitly unaffected: foreign crewmembers on vessels that do not engage in ship-to-ship liquid cargo transfer continue to use the existing C-1 and D-1 or D-2 classifications under the same 29-day limitations as before.
Practical Implications
For lightering crewmembers and the operators who employ them, the shift from discretionary parole to a formal nonimmigrant classification carries several practical consequences. First, crewmembers will now need to obtain the appropriate visa, a C-1/D combination visa endorsed for the C-4 or D-3 classification, or a standalone visa in either category, before traveling to the United States, unless they qualify for an applicable visa exemption. The parole process many operators had grown accustomed to will no longer serve as the default entry mechanism.
Second, while the 180-day authorized period lines up with typical lightering contract durations, neither C-4 nor D-3 status is eligible for extension of stay or change of status. Crewmembers who remain beyond their authorized period face statutory penalties. Operators should make sure contract terms and crew rotation schedules are calibrated against these hard limits rather than relying on informal extensions.
Third, CBP will now track lightering crew entries under dedicated classification codes, generating data that wasn’t previously available. The rule’s preamble notes this change carries no direct cost to the public, but increased visibility may come with closer CBP scrutiny of documentation, particularly around the connection between a crewmember’s activities and the statutory definition of ship-to-ship liquid cargo transfer operations to or from a vessel engaged in foreign trade. Operators whose vessels perform mixed operations should carefully document that the relevant activities qualify under ESLIA’s definitions.
Finally, the clarification that lightering operations do not constitute employment in the United States resolves a potential compliance ambiguity for companies concerned about unauthorized employment liability. That protection, however, applies specifically to the lightering activity itself; other work performed aboard a vessel by C-4 or D-3 crewmembers could raise different questions.
What to Watch For Next
Because this is a final rule already in effect as of August 11, 2026, there’s no comment period or further rulemaking expected on these specific regulatory changes. Stakeholders should watch for whether the Department of State issues updated visa guidance on how consular officers will process applications designating C-4 or D-3 classification, since the visa application process involves State Department procedures that DHS doesn’t control directly. Operators who previously managed crew immigration through parole arrangements should review current CBP field guidance to make sure their processes reflect the new classifications, and should confirm that crew documentation at the port of entry matches what CBP officers will now expect to see.
How Immigration Professional Association Can Help
Immigration Professional Association works with maritime industry clients, energy sector operators, and international employers who depend on foreign nationals to staff specialized roles that don’t fit neatly into the standard employment visa categories. The shift from discretionary parole to the C-4 and D-3 classifications is the kind of structural change that calls for a careful review of existing crew management processes, particularly for operators who have relied on CBP parole for years and may not yet have built the visa application workflow the new framework requires.
Our team can evaluate whether your current crew rotation and documentation practices are aligned with what CBP and the Department of State will now require under ESLIA’s implementing regulations, identify whether any of your vessel operations fall within the defined scope of ship-to-ship liquid cargo transfer for classification purposes, and help coordinate the visa documentation process for crewmembers who will need to enter under C-4 or D-3 designations going forward.
If your company employs foreign lightering crews operating in U.S. waters, or if you’re unsure whether your current immigration approach remains compliant now that this rule has taken effect, reach out to Immigration Professional Association for a consultation on how this update applies to your operations.
