A post assembly having a first post member, a second post member positioned within the first post member, and a sleeve member installed in the ground. The first and second post members are insertable into the sleeve member and the second post member is rotatable relative to the first post member and the sleeve member to inhibit separation of the first post member and the second post member from the ground sleeve. The first post member includes a first passage, the second post member includes a second passage having a first section and a second section, and the sleeve member includes a latch pin that travels along the first and second passages. When the latch pin is in a particular position within the first and second passages, removal of the first post member and the second post member from the sleeve member is inhibited.