and the systems were established as among the largest satellite constellations in the world, with multi-band communication, radar imaging, optical imaging and meteorological satellites. 1990s and early 21st century The arrival of PSLV in 1990s became a major boost for the Indian space program. With the exception of its first flight in 1994 and two partial failures later, PSLV had a streak of more than 50 successful flights. PSLV enabled India to launch all of its low Earth orbit satellites, small payloads to GTO and hundreds of foreign satellites. Along with the PSLV flights, development of a new rocket, a Geosynchronous Satellite Launch Vehicle (GSLV) was going on. India tried to obtain upper-stage cryogenic engines from Russia's Glavkosmos but was blocked by the US from doing so. As a result, KVD-1 engines were imported from Russia under a new agreement which had limited success and a project to develop indigenous cryogenic technology was launched in 1994, taking two decades to reach fulfillment. A new agreement was signed with Russia for seven KVD-1 cryogenic stages and a ground mock-up stage with no technology transfer, instead of five cryogenic stages along with the technology and design in the earlier agreement. These engines were used for the initial flights and were named GSLV Mk.1. ISRO was under US government sanctions between 6 May 1992 to 6 May 1994. After the United States refused to help India with Global Positioning System (GPS) technology during the Kargil war, ISRO was prompted to develop its own satellite navigation system IRNSS which it is now expanding further. In 2003, when China sent humans into space, Prime Minister Atal Bihari Vajpayee urged scientists to develop technologies to land humans on the Moon and programs for lunar, planetary and crewed missions were started. ISRO launched Chandrayaan-1 in 2008, purportedly the first probe to verify the presence of water on the Moon and the Mars Orbiter Mission in 2013, the first Asian spacecraft to enter Martian orbit; India was the first country to succeed at that on its first attempt. Subsequently, the cryogenic upper stage for GSLV rocket became operational, making India the sixth country to have full launch capabilities. A new heavier-lift launcher GSLV Mk III was introduced in 2014 for heavier satellites and future human space missions. Agency logo ISRO did not have an official logo until 2002. The one adopted consists of an orange arrow shooting upwards