BICEP2 was supported by the U.S. National Science Foundation under Grants No. ANT-0742818 and ANT- 1044978 (Caltech and Harvard) and ANT-0742592 and ANT-1110087 (Chicago and Minnesota). The development of antenna-coupled detector technology was supported by the JPL Research and Technology Development Fund and Grants No. 06-ARPA206-0040 and 10-SAT10-0017 from the NASA APRA and SAT programs. The Keck Array project was supported by the National Science Foundation under Grants ANT-1145172 (Harvard), ANT-1145143 (Minnesota) and ANT-1145248 (Stanford), and from the Keck Foundation (Caltech). We thank the sta of the U.S. Antarctic Program and in particular the South Pole Station without whose help this research would not have been possible. The development of Planck has been supported by: ESA; CNES and CNRS/INSU-IN2P3-INP (France); ASI, CNR, and INAF (Italy); NASA and DoE (USA); STFC and UKSA (UK); CSIC, MICINN, JA and RES (Spain); Tekes, AoF and CSC (Finland); DLR and MPG (Germany); CSA (Canada); DTU Space (Denmark); SER/SSO (Switzer-land); RCN (Norway); SFI (Ireland); FCT/MCTES (Portugal); and ERC and PRACE (EU).