As of 2018, the Polish Armed Forces have a combined strength of 144,142 soldiers. The Polish Navy primarily operates on the Baltic Sea and conducts operations such as maritime patrol, search and rescue for the section of the Baltic under Polish sovereignty, as well as hydrographic measurements and research. The Polish Air Force routinely takes part in Baltic Air Policing assignments. In 2003, the F-16C Block 52 was selected as the new general multi-role fighter for the air force. In January 2020, Poland has approved the delivery for F-35 Lightning II combat aircraft. Poland is currently spending 2% of its GDP on defence (approximately US$13.5 billion in 2020), which is expected to grow to 2.5% by 2030. According to SIPRI, the country exported EUR€487 million worth of arms and armaments to other countries, primarily to the United States, Chile, France and South Africa.