Standard uniform for all ranks since the late 1920s was the US Army tropical 'Chino' khaki cotton shirt and pants, worn with the US M1912 Campaign Hat (a.k.a. 'Montana Peak Hat') in Olive Drab felt with the triangular Nicaraguan national cap badge. Military Academy cadets were issued a special version of the 'Chino' uniform, with the shirt modified by the addition of black shoulder straps and breast pockets' flaps dyed black. Officers and sometimes NCOs wore in the field breeches and riding boots or the US M1931 cavalry laced boots whereas the other ranks' had their trousers trucked into US-type canvas (or leather) gaiters and ankle boots. The latter consisted of brown leather Field Shoes M-1918 (Pershing boot) and Type II/III Service Shoes, later replaced by the M-1943 Combat Service Boots and the M-1948 Russet Leather Lace-Up Boots. A four-pocket, open-collar beltless tunic modelled after the US M1926 pattern was adopted by Guardia Officers' and worn with a khaki shirt and tie, replaced by a white shirt and black tie on formal occasions; in active and formal service, a brown leather Sam Browne belt (US Officer's belt, M1921) was frequently worn with the tunic. A tropical white linen dress uniform very similar to the US Navy's Service Dress White or "chokers", was adopted by the Guardia and naval service officers and Military Academy cadets. Comprising a high-collar tunic, slacks and white shoes plus a matching peaked cap, the tunic was worn with removable exaggerated twisted cord epaulettes and a red silk sash tied around the waist on formal occasions whilst enlisted ranks wore exaggerated black buff chevrons instead. Starting in the mid-1930s, Guardia officers began being issued with the M1937 or M1942 American peaked caps, in either light tropical khaki and Olive Drab wool cloth, which slowly began to replace the campaign hat in service dress. The khaki US M1934 sidecap (a.k.a. 'garrison cap') was also supplied to GN personnel during the 1930-1940s.