You have a C1/D transit/crewmember visa from the US, and want to know if you can transit the US en route to a third country.
The answer is yes.
This visa has two types of permitted usage:
- C1 visas can be used to transit the United States en route to a third country, or en route to or from a ship arriving to or departing the United States. Anyone can have a C1 visa.
- D visas can be used to transit the United States when working on a ship that arrives and departs from the United States, as a crewmember of that ship.
Since your visa is a combined C1/D visa, you can transit the US en route to a third country. You are allowed to exit the airport, change planes, get a hotel, or even cross the country on horseback, provided you leave the US within the time stamped on your passport (typically 29 days).