You Do Need power plug adapter while traveling from Myanmar (Burma) 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 Myanmar (Burma) are A, C, D, G and I. This is how they look like.

Myanmar (Burma)

In Myanmar (Burma), outlets of type A, C, D, G and I are in use.

Type A

Type C

Type D

Type G

Type I

Marshall Islands

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

Type A

Type B