If transiting via Guam and Hawaii, non-US citizens need to apply for an ESTA under the Visa Waiver Program or acquire a USA visa before traveling.
Passport holders from most western countries are issued a 30 days tourist visa on arrival and the duration of stay is authorized for the number of days requested.
Your passport should be valid for a minimum period of 4 months from the date of entry into Chuuk. You are also required to show a confirmed ticket to leave Chuuk or any country you are transiting through, before boarding your flight.