1. Definition and nature: comrades-in-arms party: A comrades-in-arms party is a private gathering activity, usually organized by a group of people who have participated in the army or fighting together. This kind of party aims to enhance the affection and friendship between comrades-in-arms by spending time. Comrades' Friendship Association: Comrades' Friendship Association is a formal organization or association activity, which is dedicated to contacting veterans, veterans and other related military personnel. The purpose of this kind of fraternity is to promote exchanges and inherit the honor and values of soldiers, and it may be related to charity and social services.

2. Participants: Comrades' parties: Comrades' parties are usually organized by individuals or a small group, and the participants are mainly comrades who have served together or engaged in the same task. Participants are usually close friends or familiar colleagues. Comrades' Association: Comrades' Association is a larger and formal organization, which can attract a wider group of members, including veterans, veterans and other military-related personnel. There may be no intimate relationship between the participants, but they share the military identity and experience.

3. Purpose and activity form: Comrades' party: The main purpose of Comrades' party is to provide an opportunity for comrades to get together, recall their experiences, share stories, strengthen friendship and have a good time. This kind of party usually focuses on dining, chatting and having fun. Comrades' Friendship Association: The purpose of Comrades' Friendship Association is to promote contacts and exchanges between veterans and relevant military personnel. It can be realized by holding regular meetings, seminars, commemorative activities, lectures and other forms, aiming at inheriting military culture, organizing charitable fund-raising, providing resources and help, etc.