You Do Need power plug adapter while traveling from South Sudan 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 South Sudan are C and D. This is how they look like.

South Sudan

In South Sudan, outlets of type C and D are in use.

Type C

Type D

Marshall Islands

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

Type A

Type B