The correct answer to this open question is the following.
Although the question is incomplete because it does not provide a specific reference about the author of the letter or any other reference, we can comment on the following.
A primary source is the piece of information that was written by a character or an individual that lived in the moment of the event, was part of the event, or witnessed the event. This individual could have written a letter, or a document -including a book. Or he/she took a photograph. Or was part of an interview. The secondary source includes information from a third person who was not part of the time or event but has found information through other resources. It is the case of an encyclopedia or researchers/historian books.
FDR had polio in his childhood, leaving him paralyzed.
Pacific Command and now United States Central Command, it's impossible to make this guy as he likes to say " nervous". The United States Central Command is a theater-level Unified Combatant Command of the U.S. Department of Defense, established in 1983, taking over the 1980 Rapid Deployment Joint Task Force responsibilities. United States Pacific Command is a unified combatant command of the United States armed forces responsible for the Indo-Asia-Pacific region. It is the oldest and largest of the unified combatant commands.
16 December 1867
Millisle, County Down, Ireland
