Each congregation is one ward (or branch). A ward might contain only people who speak a language other than the local language of its area. Examples include areas next to large U.S. military bases in foreign countries, where English-language wards may be organized, and major U.S. cities with many immigrants, where wards using Spanish, dialects of Chinese, or other languages are often formed. In some places, there are special wards for deaf people, where the services are held in the local sign language (such as American Sign Language in English-speaking North America). The church also has "singles wards", in which the congregation is made up only of single adults. In turn, there are two types of singles wards—Young Single Adult (YSA), for ages 18 to 30, and Single Adult (SA), for those over 30.