The upper atmosphere (50-150 km) is a region which is affected both by anthropogenic activities from the surface and space weather above. One of the interesting phenomena is the presence of the meteoric metal layers in a very narrow altitude range in the mesosphere / lower thermosphere (MLT), which has been known for several decades through lidar, rocket and satellite measurements. The meteoric metals are very useful tracers for investigating coupling processes and testing atmospheric models of the upper atmosphere. Investigating different MLT metal layers within the same model allows a better understanding of the astronomy, chemistry and transport processes that control the different metal layers in the MLT. Since 2013 we have successfully developed the first global atmospheric model of meteoric metals (Na, Fe, K, Si and Mg) (e.g. Marsh et al., 2013, Feng et al., 2013, Plane et al., 2014; 2016, Langowski et al., 2015) based on the NCAR Community Earth System Model (CESM), and have built a self-consistent model to form meteoric smoke particles from ablated metal atoms. One interesting problem is reconciling the injection flux of the different metals required by the model, with the meteoric input function derived from lidar observations of vertical Na and Fe fluxes, and the cosmic spherule deposition at the surface (Carrillo-Sanchez et al., 2016). Here we revisit the global atmospheric model of meteoric metal layers based on the new NCAR WACCM5 (and WACCM-X which extends up to 600 km). Recently we have run WACCM spectral element (ne30) with a higher horizontal resolution of 1 x 1 degree, in order to test whether the lack of horizontal resolution in the standard version of the model (1.9 x 2.5 degree) means that gravity-wave driven chemical transport is underestimated. We will also present the WACCM-Ca model result and introduce our recently funded project “First study of the global Nickel and Aluminium Layers in the upper atmosphere (NIALL)” which is to explore the MLT chemistry of two elements - Ni and Al - that have not been studied before.