You Do Need power plug adapter while traveling from Dominican Republic to Marshall Islands.

Here is Why You Need An Adapter

The outlet and plug type used in Marshall Islands are A and B and in Dominican Republic are A, B and C. This is how they look like.

Dominican Republic

In Dominican Republic, outlets of type A, B and C are in use.

Type A

Type B

Type C

Marshall Islands

In Marshall Islands, outlets of type A and B are in use.

Type A

Type B