You recently read about a volunteer opportunity overseas. Write a letter to ask about applying. In your letter:

Dear Sir/Madam: I am writing this letter with regard to the volunteer opportunity for doctors I saw advertised in the Daily Mail. As described in the advertisement, the position you are seeking to fill is for a doctor with a desire to travel to Africa for six months of the year. I understand that the position would not require treating unusual diseases, but instead would primarily focus on general preventative measures and practices. This appeals to me on several levels. I find the medical work here fascinating, and I have always loved to travel. In the past, I have gone to various East African countries, but I very much look forward to visiting other parts of the continent. My experience and skills make me an excellent fit for this position. As a general practitioner, I believe I am well qualified to assist your organization’s patients. Additionally, my superiors have frequently noted by ability to adapt well to new situations. Thank you for your time and consideration. Yours faithfully, Rachel Dale