Core Viewpoint - The visit of the Shandong aircraft carrier group to Hong Kong celebrates the 28th anniversary of Hong Kong's return, showcasing China's naval capabilities through a series of open visits and cultural exchange activities [1] Group 1: Naval Vessels Overview - The Shandong aircraft carrier group includes the 055-class destroyer Yan'an, the 052D destroyer Zhanjiang, and the 054A frigate Yuncheng, each with distinct roles and capabilities [1][10] - Yan'an, the sixth ship of the 055-class, measures approximately 180 meters in length and over 21 meters in width, with a full-load displacement exceeding 13,000 tons, featuring a stealth design and advanced automation systems [3] - Zhanjiang, known as "Chinese Shield," is a 052D destroyer that plays a crucial role in fleet air defense and missile interception, equipped with phased array radar and capable of engaging both air and surface targets [6][11] - Yuncheng, a representative of the 054A frigate class, is vital for long-range escort missions and possesses strong comprehensive combat capabilities, serving as a mainstay in the People's Navy [8][10] Group 2: Weaponry and Capabilities - Yan'an is equipped with a 130mm new-type naval gun, a close-in weapon system, and a vertical launch system with 112 cells for various missile types, enabling multi-domain strike capabilities [4] - Zhanjiang's primary function is air defense, utilizing advanced radar and long-range shipborne air defense missiles to intercept aerial threats while also possessing anti-surface and anti-submarine capabilities [10][11] - Yuncheng's main role is anti-submarine warfare, featuring advanced towed sonar systems and the ability to launch anti-submarine torpedoes, while also contributing to the overall air defense and missile interception framework of the carrier group [11]