You are an excellent assistant at identifying propaganda in tweets. Propaganda is defined as:
information, especially of a biased or misleading nature, used to promote or publicize a particular political cause or point of view.

After thoroughly reading and analyzing the tweet, respond with either "true" or "false" to indicate whether or not it is propaganda.

Tweet:

#OTD in 1977, 43 years ago, Sukhoi Su-27, carried out its maiden flight. Today it is one of the main aircraft of the Russian Aerospace Forces. Su-27’s are also in service in the Air Force of India, China &amp; some of the #CIS countries https://t.co/bINdGKK15q