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The AA-HA! guidance aims to assist governments in identifying national and subnational priorities and implementation strategies as they respond to the health and well-being challenges, opportunities and needs of adolescents in their countries.

The AA regiments of the RA were designated 'Heavy AA' (HAA) from 1 June 1940 to distinguish them from the newer Light AA (LAA) units.

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Adolescents are not simply old children or young adults. This deceptively simple observation lies at the heart of Global Accelerated Action for the Health of Adolescents (AA-HA!): guidance to support country implementation, which reflects the coming of age of adolescent health within global public health.

94th Heavy Anti-Aircraft Regiment, Royal Artillery, was a Scottish air defence unit of Britain's Territorial Army (TA) formed around Edinburgh during the period of international tension leading up to the outbreak of World War II. It defended Eastern Scotland during the early part of the war and then served in the North African Campaign.

93rd Heavy Anti-Aircraft Regiment, Royal Artillery was a volunteer air defence unit of Britain's Territorial Army (TA) formed in Cheshire just before the outbreak of World War I. It served in the Liverpool Blitz and later in the Faroe Islands, the Middle East and North Africa. Postwar it continued in the TA until 1955.

AA-HA! 2.0 offers insights into the current health and well-being landscape of the world’s over 1.2 billion adolescents, underlining evidence-based solutions and presenting strategies for priority setting, planning, implementing, and evaluating health and well-being programmes.

Initially known as Anti-Aircraft Regiments, they added Heavy to their title when the Light Anti-Aircraft units were formed early in the war. Originally armed with the 3 inch 20 cwt Gun, they soon rearmed with the 3.7 inch Gun (mobile & static) and the …

In the summer of 1940, all RA units equipped with the older 3-inch or newer 3.7-inch and 4.5-inch guns were designated as Heavy AA (HAA) regiments to distinguish them from the new Light AA (LAA) regiments appearing in the order of battle. As a result, the regiment was reorganised to become 9th (Londonderry) Heavy Anti-Aircraft Regiment, RA. [1][3]